question Which MySQL clause is used to add an index to an existing table

In SQL Server, what is the purpose of the PI constant?

A. Mathematical constant representing the ratio of a circle's circumference to its diameter
B. Numeric constant representing the speed of light
C. Constant representing the number of days in a year
D. Constant representing the number of seconds in a minute

In SQL Server, what is the purpose of the SQL Server XML data type method value()?

A. Extract a single value from an XML string
B. Combine multiple XML values
C. Concatenate XML strings
D. Validate XML structure

In MySQL, what is the purpose of the SHOW TABLES statement?

A. Display the structure of a table
B. Show the list of tables in a database
C. Display the content of a table
D. Show the indexes of a table

In SQL Server, what is the purpose of the PARSE() function?

A. Concatenate multiple columns
B. Parse a string into a specified data type
C. Calculate the average value
D. Generate a sequence of numbers

In Oracle, what is the purpose of the ROLLBACK statement?

A. Save changes to the database
B. Undo changes made during the current transaction
C. Commit changes to the database
D. Delete records from the database

Which SQL Server statement is used to rename a table?

A. RENAME TABLE
B. ALTER TABLE RENAME
C. ALTER TABLE RENAME TO
D. ALTER TABLE RENAME AS

In Oracle, which data type is used to store fixed-length character strings?

A. VARCHAR2
B. CHAR
C. CLOB
D. VARCHAR

In Oracle, what is the purpose of the WITH clause?

A. Combine rows from two or more tables
B. Create a temporary result set for use in a SELECT statement
C. Sort the result set
D. Join multiple tables

In Oracle, what is the purpose of the JOIN clause?

A. Combine rows from two or more tables
B. Retrieve all rows from the left table
C. Retrieve rows that have no matching rows in the right table
D. Exclude specified rows

What is the purpose of the SQL IN operator?

A. Filter rows based on a range
B. Filter rows based on a list of values
C. Sort the result set
D. Join multiple tables

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