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Oracle CAST function

14 July 2020

Oracle CAST function

The Oracle/PLSQL CAST function converts (converts) one data type into another.

Oracle/PLSQL CAST function syntax

CAST ( { expr | ( subquery_id ) | MULTISET ( subquery_id ) } AS type_name_id )

The following transformations are allowed:

Where’s fromWhere to
char,
varchar2
numberdatetime /
interval
rawrowid,
urowid
nchar,
nvarchar2
char, varchar2XXXXX
numberXX
datetime / intervalXX
RawXX
rowid, urowidXX
nchar, nvarchar2XXXXX

 

Note:

The CAST function returns a new data type to which you have converted.

If the resulting value is larger than the target type, an error is returned.

You can use the CAST function in the following versions of Oracle/PLSQL

Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i

Let’s consider some examples of the CAST function and learn how to use the CAST function in Oracle/PLSQL.

SQL> select CAST( '22-Jul-2020' AS varchar2_id(30) ) FROM DUAL;

--result: 22-Jul-2020.

This query converts the date (that is: 22-Jul-2020) to varchar2_id(30).

Sql Training Online – Cast Function

 
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