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If this is omitted, and the subquery returns multiple rows, it will only return a single row. MULTISET (optional): This keyword indicates that the subquery results will return multiple rows, and are then CAST into a collection value.expr (mandatory choice): This is the value or expression that is to be converted to another data type.Or, you can run it using a subquery, which would be: CAST( MULTISET (subquery) AS type_name ) You can run it using a single result data type, which would be: CAST( expr AS type_name ) There are two main ways you can run this query. This structure is a little different as it does not separate the parameters by a comma, as many other functions do.
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The syntax for the Oracle CAST function is: CAST( AS type_name )
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Related: How to Convert Data Types in Oracle SQL. It allows for more functionality than the TO_NUMBER, TO_CHAR and TO_DATE functions, as it allows you to specify the actual data types you want to convert to, rather than just use the defaults of those functions. The purpose of the Oracle CAST function is to convert one data type to another. Learn how to use it and what it can do in this article. The Oracle CAST function is quite powerful, but it can be hard to use.