CAST changes the data type of a column in the query

CAST changes the data type of a column in the query

• A. CAST
• B. Trim
• C. IN
• D. Derived Column

Answer: (A)

The idea being tested is how to change a value’s data type within a query. This is done with CAST, which explicitly converts an expression to a specified datatype using the syntax CAST(expression AS datatype). For example, CAST(price AS INT) turns a numeric or decimal price into an integer, or CAST(name AS VARCHAR(50)) converts a value to a string of up to 50 characters. This explicit conversion is essential when you need to perform operations that require matching types or to control the format of the result. The other options don’t perform a type change. Trimming removes whitespace and leaves the type the same (often still a string). IN is a predicate that checks whether a value is in a given list, not a conversion. Derived Column is an ETL/tool-specific concept for creating or transforming columns in a data flow, not a standard SQL datatype conversion within a query.

The idea being tested is how to change a value’s data type within a query. This is done with CAST, which explicitly converts an expression to a specified datatype using the syntax CAST(expression AS datatype). For example, CAST(price AS INT) turns a numeric or decimal price into an integer, or CAST(name AS VARCHAR(50)) converts a value to a string of up to 50 characters. This explicit conversion is essential when you need to perform operations that require matching types or to control the format of the result.

The other options don’t perform a type change. Trimming removes whitespace and leaves the type the same (often still a string). IN is a predicate that checks whether a value is in a given list, not a conversion. Derived Column is an ETL/tool-specific concept for creating or transforming columns in a data flow, not a standard SQL datatype conversion within a query.