question Which SQL Server statement is used to create a unique constraint on a column

In SQL Server, what is the purpose of the UNPIVOT operator?

A. Combine rows from two or more tables
B. Rotate columns into rows based on values in a specified column
C. Sort the result set
D. Join multiple tables

In SQL Server, what is the purpose of the SEQUENCE object?

A. Generate a sequence of numbers
B. Execute a set of statements in a loop
C. Define a cursor for record processing
D. Create a temporary table

What is the purpose of the SQL TRUNCATE TABLE statement?

A. Remove specific records
B. Remove all records and reset auto-increment
C. Remove duplicate records
D. Remove NULL values

Which SQL Server statement is used to grant execute permissions on a stored procedure?

A. GRANT EXECUTE
B. GRANT EXECUTION
C. ALLOW EXECUTE
D. ALLOW EXECUTION

In MySQL, what is the purpose of the DESC keyword in an ORDER BY clause?

A. Sort in descending order
B. Specify a description
C. Sort in ascending order
D. Display columns

What is the purpose of the SQL Server XML INDEX option?

A. Index an entire XML column
B. Index specific elements or attributes in an XML column
C. Exclude XML columns from indexing
D. Disable indexing for XML columns

What is the purpose of the SQL Server RAISEERROR statement?

A. Suppress errors in a query
B. Display a custom error message
C. Count the number of errors in a query
D. Create a temporary error table

In MySQL, which function is used to concatenate two or more strings?

A. CONCAT()
B. MERGE()
C. COMBINE()
D. STRING()

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

A. Concatenate multiple values
B. Convert a value to a different data type and handle errors gracefully
C. Find the average value
D. Validate XML structure

Which SQL Server statement is used to remove all records from a table and reset identity seed?

A. DELETE TABLE
B. REMOVE TABLE
C. TRUNCATE TABLE
D. DROP TABLE

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