Sql Query Quiz Questions And Answers
Improve Your SQL Skills with Quiz Questions and Answers
Sql Query Quiz Questions And Answers
A SQL query quiz typically includes a series of questions that assess a person's knowledge and proficiency in writing SQL queries to retrieve, manipulate, and manage data in a database. These questions may cover a range of topics such as selecting specific columns from a table, filtering data using conditions, grouping and aggregating data, joining tables, and using functions. The answers to these questions require an understanding of SQL syntax, operators, functions, and best practices in database querying. Test-takers are evaluated based on the accuracy and efficiency of their SQL queries, as well as their ability to solve problems and extract meaningful insights from the data. Practicing SQL query quiz questions can help individuals improve their SQL skills and prepare for job interviews or exams in the field of database management.
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1 - What does SQL stand for?
SQL stands for Structured Query Language.
2) What is a primary key in a database?
A primary key is a unique identifier for each record in a database table and ensures that each record is distinct.
3) What is the difference between the WHERE and HAVING clauses in SQL?
The WHERE clause is used to filter records before any groupings are made, while the HAVING clause is used to filter records after the groupings have been made.
4) What is the ‘ORDER BY’ clause used for in SQL?
The ORDER BY clause is used to sort the result set by one or more columns in ascending or descending order.
5) What is a join in SQL?
A join is used to combine rows from two or more tables based on a related column between them.
6) What are the different types of joins in SQL?
The different types of joins in SQL are INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.
7) What is the purpose of the GROUP BY clause in SQL?
The GROUP BY clause is used to group rows that have the same values into summary rows.
8) Explain the difference between the COUNT(*) and COUNT(column_name) functions in SQL.
The COUNT(*) function counts all rows in a table, while the COUNT(column_name) function counts the number of non null values in the specified column.
9) What is the difference between a SQL view and a table?
A SQL view is a virtual table based on the result set of a SQL statement, while a table is a physical structure that stores data.
10) What is a subquery in SQL?
A subquery is a query nested within another query and is used to return data that will be used in the main query.
11) How can you remove duplicate values from a result set in SQL?
You can remove duplicate values from a result set in SQL by using the DISTINCT keyword in the SELECT statement.
12) What is a transaction in SQL?
A transaction in SQL is a sequence of operations that are treated as a single unit of work that must either be fully completed or fully aborted.
13) What is the purpose of the COMMIT and ROLLBACK statements in SQL?
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The COMMIT statement is used to save the changes made by a transaction, while the ROLLBACK statement is used to undo the changes made by a transaction.
14) How can you insert data into a table in SQL?
You can insert data into a table in SQL using the INSERT INTO statement followed by the table name and values to be inserted.
15) What is a stored procedure in SQL?
A stored procedure in SQL is a precompiled set of SQL statements that perform a specific task and can be executed multiple times without recompiling.
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