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Updated for the latest database management systems -- including MySQL 6.0, Oracle 11g, and Microsoft's SQL Server 2008 -- this introductory guide will get you up and running with SQL quickly. Whether you need to write database applications, perform administrative tasks, or generate reports, Learning SQL, Second Edition, will help you easily master all the SQL fundamentals. Each chapter presents a self-contained lesson on a key SQL concept or technique, with numerous illustrations and annotated examples. Exercises at the end of each chapter let you practice the skills you learn. With this book, you will: Move quickly through SQL basics and learn several advanced features Use SQL data statements to generate, manipulate, and retrieve data Create database objects, such as tables, indexes, and constraints, using SQL schema statements Learn how data sets interact with queries, and understand the importance of subqueries Convert and manipulate data with SQL's built-in functions, and use conditional logic in data statements Knowledge of SQL is a must for interacting with data. With Learning SQL, you'll quickly learn how to put the power and flexibility of this language to work. | Author: Alan Beaulieu | Publisher: O'Reilly Media | Publication Date: April 30, 2009 | Number of Pages: 336 pages | Language: English | Binding: Paperback | ISBN-10: 0596520832 | ISBN-13: 9780596520830

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Trying to find T-SQL Fundamentals ? Author : Itzik Ben-Gan Publisher : Pearson Education Total Pages : 464 Effectively query and modify data using Transact-SQL Master T-SQL fundamentals and write robust code for Microsoft SQL Server and Azure SQL Database. Itzik Ben-Gan explains key T-SQL concepts and helps you apply your knowledge with hands-on exercises. The book first introduces T-SQL s roots and underlying logic. Next, it walks you through core topics such as single-table queries, joins, subqueries, table expressions, and set operators. Then the book covers more-advanced data-query topics such as window functions, pivoting, and grouping sets. The book also explains how to modify data, work with temporal tables, and handle transactions, and provides an overview of programmable objects. Microsoft Data Platform MVP Itzik Ben-Gan shows you how to: Review core SQL concepts and its mathematical roots Create tables and enforce data integrity Perform effective single-table queries by using the SELECT statement Query multiple tables by using joins, subqueries, table expressions, and set operators Use advanced query techniques such as window functions, pivoting, and grouping sets Insert, update, delete, and merge data Use transactions in a concurrent environment Get started with programmable objects from variables and batches to user-defined functions, stored procedures, triggers, and dynamic SQL " Download T-SQL Fundamentals Here Get T-SQL Fundamentals PDF Here Download T-SQL Fundamentals PDF Download T-SQL Fundamentals Books Get This T-SQL Fundamentals Book Free Download T-SQL Fundamentals Books PDF Get this T-SQL Fundamentals PDF Download Free

Hello guys, whether you are preparing for Java developer interview or any other Software Developer Interview, a DevOps Interview or a IT support interview, you should prepare for SQL and Database related questions. Along with Data Structure, Algorithms, System Design, and Computer Fundamentals, SQL and Database are two of the essential topic for programming or technical Job interview. In the past, I have shared many questions related to MSSQL questions, Oracle Questions, MySQL questions, and PostgreSQL questions and in this article, I am going to share both theory based and query based Database and SQL Interview questions with to the points answers. This article mainly contains two types of interview questions, first which is based ANSI SQL and applicable to all major database, and the second database specific questions e.g. some questions are based on Oracle database, some are MySQL specific and many are based upon SQL Server. Depending upon candidate's experience in the respective database, you can ask database specific questions as well. For example, If a candidate says that he has worked for 4 years in SQL server, you can ask about ISNULL() and COALESCE(), and if he has worked a couple of years in Oracle database, then you can ask about MERGE statement and how to write pagination query in Oracle. 21 Basic SQL Interview Questions and AnswersNow, let's start with the basic SQL interview questions which covers essential SQL concepts like joins, aggregation, indexes, primary and foreign keys, SQL commands like SELECT and DELETE and much more. 1. Give two differences between primary and unique key constraint? Primary key constraints create a clustered index and don't allow null, while the unique key creates non-clustered and can be null. Another difference is that one table can have only one primary key while it allows having many unique keys. This is one of the easiest questions you can get on any SQL interview, so don't fluff it, it might be the interviewer's weed out question. 2. How many clustered index a table can have? Only one and that's why only one primary key per table. You can create a clustered index while creating a table or you can add it later. 3. How many non-clustered indexes per table? As many you want but must be under the limit your vendor enforce e.g. SQL Server allows around 280 indexes, but beware of consequences of adding many indexes on table, it might be able to help you search faster but it has space overheads as well as makes your insert and update slower due to additional time is taken to update indexes. 4. What is the difference between truncate and delete? (answer) truncate fast, and should be used to remove all data from a table without removing the metadata e.g. index, while delete removes rows one by one and much slower than truncate. delete also create a log and can blow up log segment if you try to clear a large table using delete clause. 5. What is the difference between primary and candidate key in SQL? (answer) There can be more than one column which can uniquely identify a row, all of these columns are a candidate to become primary key, but apart from those who become primary key or part of it, rest of them are known as candidate keys. 6. What is the difference between UNION and UNION ALL in SQL? (answer) The union is a special keyword which is used to combine the result of two SQL query e.g. suppose you have to ask all red and blue color balls then you can write two queries to get different color balls and can combine them using the union. Now both can be used to combine but UNION removes duplicate rows while UNION ALL keeps it. A row is considered duplicate if all columns have the same values. remember UNION is based upon data so the name of columns can be different. 7. What is the fastest way to empty a table in SQL? (answer) In my opinion, truncate is the fasted command to empty a table without dropping it. Alternative can be to DROP and recreate the table. Delete can also be used to clear table but it is much slower than truncate, you should only use delete command to remove only selective rows, as truncate doesn't support conditional delete. 8. What is the difference between INNER and OUTER JOIN in SQL? (answer) INNER join is used to retrieve matching rows from multiple related tables while OUTER JOIN is used to retrieve all data from one table and matching records from another table. There are two types of outer join like LEFT and RIGHT outer join depending upon the all the data you need from that table. Here is a nice diagram which illustrate the difference between difference JOINS in SQL 8. What is the difference between WHERE and HAVING clause in SQL? (answer) Though both where and having are used to filter rows there is a subtle difference between them which become obvious during grouping. Conditions on WHERE clause is used to filter rows before grouping while HAVING clause is used to filter rows after grouping. Also, HAVING can only be used along with GROUP BY clause but WHERE can be used with or without GROUP BY. 9. What is referential integrity? (answer) Referential integrity is a relational database feature which makes integrity in a relation between two tables. For example, If we have two table Parents and Childs, where ParentID is a foreign key in Childs table, referential integrity prevents you from adding rows in child table a with parent which doesn't exist in Parents table. It can also be used to remove all children if the parent is removed from the primary table. 10. What is normalization? (answer) 11. If I have a column that will only have values between 1 and 250 what data type should I use 12. How do you enforce that only values between 1 and 10 are allowed in a column 13. How do you represent one to one relationship? ( implemented as a single table and rarely as two tables with primary and foreign key relationships) 14. How do you represent one to many relationships? (splitting the data into two tables with primary key and foreign key relationships) 15. How do you represent many to many relationships? (answer) (implemented using a junction table with the keys from both the tables forming the composite primary key of the junction table 16. How do you count unique rows in an SQL table? (answer) (by using count() and distinct) 17. What is the inner join, when should you use it? (answer) 18. What is outer join, when should you use it? 19. What is NULL in SQL? How do you test for NULLs? (answer) (NULL and nothing are different in SQL) 20. What is the result of NULL=NULL and NULL<> NULL? (answer) (for null checking we use "is null" or "is not null" by the way NULL=NULL IS NULL NULL<> NULL IS NULL) 21. What are 12 rules of Tedd Codd? ( these rules forms basis of RDBMS) (answer) Seriously I don't remember all those rules so I don't bother asking it but I have seen it asked many times, good luck if you are asked. 22. What is the difference between count(*) and count(employee_name)? (answer) (former will return a count of all row, later will return only not null row) 23. The difference between view and table? (answer) (A table is a basic storage for your data in the database. A view is a stored query that appears to be a table. For example: Create view ABC as select from all_tables) 24. Where do you want to use a view? (answer) (to hide a very complex or frequent join. Instead of typing in the join every time you join multiple tables, you could create a view that would store that query for you) 24. What is the ANSI way of writing join? (answer) 25. What is Equijoin? (answer) equijoin also called an inner join is a join where matching condition between two table is equal "=". That is where a column (or multiple columns) in two or more tables match. For our example: SELECT emp.ename, dept.name FROM emp JOIN dept ON emp.deptno = dept.deptno26. What is the difference between union and join, when to use what? 25 Advanced SQL Interview Questions with Answers 27. What is the difference between clustered and non-clustered index? A clustered index is a special type of index that reorders the way records in the table are physically stored. Therefore a table can have only one clustered index. The leaf nodes of a clustered index contain the data pages A non-clustered index is a special type of index in which the logical order of the index does not match the physical stored order of the rows on disk. The leaf node of a non-clustered index does not consist of the data pages. Instead, the leaf nodes contain index rows. 28. Benefits and drawbacks of indexing? 29. You have a SQL script and suddenly your script is taking more time to execute than its normal time? what will you do? 30. If you want to delete a large amount of data which command you use truncate or delete? (truncate because truncate doesn't log while in case of delete log segment can be blown if there are too many rows to delete) 31. What is a correlated subquery, how is it different with the normal subquery? 32. What is the four isolation level? 33. What is the DUAL table in Oracle database? 34. What is bind variables and why they should be used? 35. How does Index work in SQL? 36. Does the order of index matters in a Query? 37. Difference between DROP, TRUNCATE and DELETE in SQL DROP will remove both schema and index, no trigger will be fired and cannot be rolled back. TRUNCATE will only remove all data but again no trigger will be fired and can't be rolled back. DELETE will remove data, a trigger will be fired and can be rolled back. 38. What is database statistics? How does it affect query performance? Database statistics are data used by indexes to make your query faster. When you run insert and update command, your database statistics getting out-of-sync, making your query slower, even with right index. To keep your database statistics up-to-date, it's necessary to run update statistics command in SQL Server periodically, mostly after inserting or updating a large number of data into tables. 39. Does order of columns matter in a composite index? Composite indexes (also known as multiple or concatenated indexes) are special types of the index which use more than one column. Yes, the order of columns in concatenated index matter, because it decides whether the index will be used or not in case you only supply one column in WHERE clause. 40. You have a composite index of three columns, and you only provide values of two columns in WHERE clause of a select query? Will Index be used for this operation? Answer: If the given two columns are secondary index column then the index will not invoke but if the given 2 columns contain a primary index( the first col while creating index) then the index will invoke. In your case, the composite index would not work because of the column not included in the where clause. Still you want to use an index you give an index hint like below: select /*+ INDEX(TABLE_NAME IDX_NAME) */ * from table_name; After imposing the force index you can read the explain plan and verify the cost, if an index scan is costlier than the FTS then it's not a good idea to go with index 41. Is there a way we can suggest database use a particular index in SQL Query? Yes, by using index hint, as shown in the following query will ensure that SQL server will use an index: select /*+ INDEX(TABLE_NAME IDX_NAME) */ * from table_name; SQL Query Interview QuestionsNo SQL interview is complete without asking queries. Most of the time it's the SELECT query which you need to write, but be prepared with INSERT or UPDATE queries as well. In this section, we will look at some of the frequently asked SQL queries from programming interviews. 42. Write SQL query to find the third highest salary of an employee without using TOP or LIMIT keyword? 43. Write SQL query to print the name of an employee and their manager? 44. Write SQL query to find all employees joined between date1 and date2? 45. How do you write pagination SQL query in Oracle? 46. How would you select all last names that start with S 47. How would you select all rows where the date is 20221127 SQL Performance Interview Questions 48. If your SQL query takes more time to fetch the record than what should we do to solve it? hint: like DB tuning or indexing kind 49. Between Select Count() /Count(1) — Which one is faster in SQL? Later is faster in PL/SQL but both are almost equivalent in T-SQL. PL/SQL that using count(1) to find the row count was much more high-performing than using count(), as count() fetches all the rows into memory before getting the exact count. I want to know whether this holds true for T-SQL as well, or are the two just the same? 50. If in EMP table I have null EMP_Name, so when we do Order by EMP_Name, then which values come first The one with NULL will come first mysql> select emp_name, dept_id from employee order by dept_id; +----------+---------+ | emp_name | dept_id | +----------+---------+ | Ram | NULL | | Jack | 1 | | John | 2 | | Alan | 3 | +----------+---------+ 4 rows in set (0.00 sec) the default ordering is ascending and NULL comes first. 51. You have one Query which fetches the values from table A and inserts into B. but if the A has null row than which exception occurs. 52. What happens if you don't close the cursor? It depends on whether you declared the cursor locally or globally (and what the default is in your environment - default is global but you can change it). If the cursor is global, then it can stay "alive" in SQL Server until the last piece of code is touched in the scope in which it was created. For example, if you call a stored procedure that creates a global cursor, then call 20 other stored procedures, the cursor will live on while those other 20 stored procedures are running until the caller goes out of scope. I believe it will stay alive at the session level, not the connection level, but haven't tested this thoroughly. If the cursor is declared as local, then it should only stay in scope for the current object (but again, this is theoretical, and I haven't done extensive, low-level memory tests to confirm). Not closing a cursor will keep locks active that it holds on the rows where it is positioned. Even after closing a reference is kept to the data structures the cursor is using though (so it can be reopened) These structures are Microsoft SQL Server specific (so it is not just memory space or handles or so) and depend on what the cursor is actually doing, but they will typically be temporary tables or query result sets. Not deallocating AFAIK only has to do with performance. The aforementioned resources will remain allocated and thus have a negative effect on server performance. That's all about 50+ SQL and Database Interview Questions with Answers for Software Engineers, Programmers, and Database Administrator of 1 to 3 years and up to 5 years of experienced. I have tried to include questions from different topics to provide you a better preparation. If you think a topic or question is missed feel free to suggest in comments and I will include them in this article, The ultimate goal is to make this article useful for anyone preparing for SQL and Database interview questions.

Introduction The seventh infographic summary is here for the MS AZ-900: Microsoft Azure Fundamentals cheat sheet series. During my preparation for the exam I had created these summary pages or chea…

This open access book contains eight chapters that deal with database technologies, including the development history of database, database fundamentals, introduction to SQL syntax, classification of SQL syntax, database security fundamentals, database development environment, database design fundamentals, and the application of Huawei's cloud database product GaussDB database. This book can be used as a textbook for database courses in colleges and universities, and is also suitable as a reference book for the HCIA-GaussDB V1.5 certification examination. The Huawei GaussDB (for MySQL) used in the book is a Huawei cloud-based high-performance, highly applicable relational database that fully supports the syntax and functionality of the open source database MySQL. All the experiments in this book can be run on this database platform. As the world's leading provider of ICT (information and communication technology) infrastructure and smart terminals, Huawei's products range from digital data communication, cyber security, wireless technology, data storage, cloud computing, and smart computing to artificial intelligence.

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What is Microsoft Azure? Microsoft Azure is a cloud service provider. A cloud service provider (CSPs) is a technology company that offers multiple cloud services. Azure has listed over 600 cloud service offerings, from computing to storage to databases to machine learning. Azure is the second most popular cloud platform behind Amazon Web Services (AWS). Still, many long-lived or large tech companies are embracing both cloud platforms. This may be because Azure is able to compete on cost, niche

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The whole idea behind databases is to store information, data, in order to look at it later. The place where that data is going to be kept is referred to as a table. A table consists of columns and each column can be defined to store a variety of specific kinds of data. You can […]

- Total Questions in the guide: 140 Questions with Answers - Exam Name: Database Fundamentals - Exam Code: 98-364 - This guide contains as many latest practice exam questions and answers as possible to prepare you for your 98-364 exam.

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Book Synopsis Languages may come and go, but the relational database endures. Learn how to use Ecto, the premier database library for Elixir, to connect your Elixir and Phoenix apps to databases. Get a firm handle on Ecto fundamentals with a module-by-module tour of the critical parts of Ecto. Then move on to more advanced topics and advice on best practices with a series of recipes that provide clear, step-by-step instructions on scenarios commonly encountered by app developers. Co-authored by the creator of Ecto, this title provides all the essentials you need to use Ecto effectively. Elixir and Phoenix are taking the application development world by storm, and Ecto, the database library that ships with Phoenix, is going right along with them. There are plenty of examples that show you the basics, but to use Ecto to its full potential, you need to learn the library from the ground up. This definitive guide starts with a tour of the core features of Ecto - repos, queries, schemas, changesets, transactions - gradually building your knowledge with tasks of ever-increasing complexity. Along the way, you'll be learning by doing - a sample application handles all the boilerplate so you can focus on getting Ecto into your fingers. Build on that core knowledge with a series of recipes featuring more advanced topics. Change your pooling strategy to maximize your database's efficiency. Use nested associations to handle complex table relationships. Add streams to handle large result sets with ease. Based on questions from Ecto users, these recipes cover the most common situations developers run into. Whether you're new to Ecto, or already have an app in production, this title will give you a deeper understanding of how Ecto works, and help make your database code cleaner and more efficient. What You Need: To follow along with the book, you should have Erlang/OTP 19+ and Elixir 1.4+ installed. The book will guide you through setting up a sample application that integrates Ecto. About the Author Darin Wilson has been coding professionally since the days when you got help with coding problems by posting a message to a BBS over a 300-baud modem. Over the years, he's developed apps for banking, education, television, social media, and robotic arms. He is currently the web team lead at Infinite Red, a web and mobile application development company.Eric Meadows-Jonsson is a member of the Elixir core team and the creator of Ecto. He is a passionate open source developer and is heavily involved in the Elixir community. He works as a developer at Forza Football.

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Object-oriented databases were originally developed as an alternative to relational database technology for the representation, storage, and access of non-traditional data forms that were increasingly found in advanced applications of database technology. After much debate regarding object-oriented versus relational database technology, object-oriented extensions were eventually incorporated into relational technology to create object-relational databases. Both object-oriented databases and object-relational databases, collectively known as object databases, provide inherent support for object features, such as object identity, classes, inheritance hierarchies, and associations between classes using object references. This monograph presents the fundamentals of object databases, with a specific focus on conceptual modeling of object database designs. After an introduction to the fundamental concepts of object-oriented data, the monograph provides a review of object-oriented conceptualmodeling techniques using side-by-side Enhanced Entity Relationship diagrams and Unified Modeling Language conceptual class diagrams that feature class hierarchies with specialization constraints and object associations. These object-oriented conceptual models provide the basis for introducing case studies that illustrate the use of object features within the design of object-oriented and object-relational databases. For the object-oriented database perspective, the Object Data Management Group data definition language provides a portable, language-independent specification of an object schema, together with an SQL-like object query language. LINQ (Language INtegrated Query) is presented as a case study of an object query language together with its use in the db4o open-source object-oriented database. For the object-relational perspective, the object-relational features of the SQL standard are presented together with an accompanying case study of the object-relational features of Oracle. For completeness of coverage, an appendix provides a mapping of object-oriented conceptual designs to the relational model and its associated constraints. Table of Contents: List of Figures / List of Tables / Introduction to Object Databases / Object-Oriented Databases / Object-Relational Databases

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This is a great exercise for students in grades 2-6 as a precursor to any lesson on shading with a pen or pencil. Introduce the shading technique of value by pressing and lightening up on the pencil. Students should fill in the values of the shading bar and the gradient bar. They should also use those values to fill in the shades of the sphere. Take a look at other shading worksheets: Shading Turkey Worksheet Take a look at other shading worksheets at: Shading Pumpkin Worksheet Take a look at other shading worksheets: Color Value Pumpkin Worksheet Take a look at other shading worksheets at: Shading Worksheet Bundle Take a look at other shading worksheets: Shading Thanksgiving Worksheet Take a look at other shading worksheets: Apple Shading Worksheet This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

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