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Questions and Answers
What does DDL stand for in SQL?
What does DDL stand for in SQL?
- Data Definition Language (correct)
- Database Definition Language
- Data Description Language
- Data Design Language
Which SQL command is used to permanently remove a table and its data?
Which SQL command is used to permanently remove a table and its data?
- Drop (correct)
- Delete
- Truncate
- Remove
What does DML stand for in SQL?
What does DML stand for in SQL?
- Data Modification Language
- Database Management Language
- Data Manipulation Language (correct)
- Database Manipulation Language
Which SQL command is used to make a temporary backup of the current state of a transaction?
Which SQL command is used to make a temporary backup of the current state of a transaction?
In SQL, which constraint is used to ensure that a column does not contain any duplicate values?
In SQL, which constraint is used to ensure that a column does not contain any duplicate values?
What does DCL stand for in SQL?
What does DCL stand for in SQL?
What is the result of the SQL query: Select Emp_Name From Employees Where Emp_ID = 2 ?
What is the result of the SQL query: Select Emp_Name From Employees Where Emp_ID = 2 ?
In the SQL query: Select * From Employees Where Not Nationality = 'Egyptian', what does the 'Not' operator do?
In the SQL query: Select * From Employees Where Not Nationality = 'Egyptian', what does the 'Not' operator do?
What does the SQL query: Select Emp_ID , Emp_Name , Salary From Employees Where Emp_ID IN (1 , 3 , 5) retrieve?
What does the SQL query: Select Emp_ID , Emp_Name , Salary From Employees Where Emp_ID IN (1 , 3 , 5) retrieve?
What is retrieved by the SQL query: Select * From Employees Where Emp_Name IN ('Ali' , 'Omar' , 'Amal')?
What is retrieved by the SQL query: Select * From Employees Where Emp_Name IN ('Ali' , 'Omar' , 'Amal')?
What does the SQL query: Select * From Employees Where Emp_Name Like 'A%' retrieve?
What does the SQL query: Select * From Employees Where Emp_Name Like 'A%' retrieve?
What is retrieved by the SQL query: Select * From Employees Where Emp_Name Like 'Z%B'?
What is retrieved by the SQL query: Select * From Employees Where Emp_Name Like 'Z%B'?
What is retrieved by the SQL query: Select * From Employees Where Emp_Name Like 'Al_'?
What is retrieved by the SQL query: Select * From Employees Where Emp_Name Like 'Al_'?
In the SQL query: Select Emp_Name , FUN , Address From Employees Where Phone Is Null, what does 'Phone Is Null' represent?
In the SQL query: Select Emp_Name , FUN , Address From Employees Where Phone Is Null, what does 'Phone Is Null' represent?
What is the result of the SQL query: Select Emp_ID , Emp_Name , Salary From Employees Where Salary Between 4000 And 6000 ?
What is the result of the SQL query: Select Emp_ID , Emp_Name , Salary From Employees Where Salary Between 4000 And 6000 ?
What is the result of the SQL query: Select Max (Salary) as Max , Min (Salary) as Min , Avg (Salary) as Average From Employees ?
What is the result of the SQL query: Select Max (Salary) as Max , Min (Salary) as Min , Avg (Salary) as Average From Employees ?
Study Notes
SQL Acronyms and Concepts
- DDL stands for Data Definition Language, used for defining database structures.
- DML stands for Data Manipulation Language, used for manipulating data.
- DCL stands for Data Control Language, used for controlling access and permissions.
SQL Commands and Constraints
- The SQL command
DROP TABLEis used to permanently remove a table and its data. - The
SAVEPOINTcommand is used to make a temporary backup of the current state of a transaction. - The
UNIQUEconstraint is used to ensure that a column does not contain any duplicate values.
SQL Queries and Operators
- The
NOToperator is used to negate a condition in a query. - The
INoperator is used to select rows that match any value in a list. - The
LIKEoperator is used to select rows that match a pattern. - The
IS NULLcondition is used to select rows where a column is null.
SQL Query Results
- A query with a
WHEREclause and a specific value (e.g.Emp_ID = 2) will return a single row that matches the condition. - A query with an
INoperator will return rows that match any value in the list. - A query with a
LIKEoperator will return rows that match the pattern (e.g.Emp_Name Like 'A%'will return rows where the employee name starts with 'A'). - A query with a range condition (e.g.
Salary Between 4000 And 6000) will return rows that fall within the specified range. - Aggregate functions (e.g.
MAX,MIN,AVG) can be used to calculate aggregate values for a column.
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Description
Test your knowledge of SQL Data Definition Language (DDL), Data Manipulation Language (DML), Data Control Language (DCL), and Transaction Control Language (TCL) with this quiz. Topics such as Create, Drop, Truncate, Rename, Alter, Comments, Insert, Delete, Update, Select, Grant, Revoke, Commit, Rollback, and more are covered.
