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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 from | Where to | |||||
|---|---|---|---|---|---|---|
| char, varchar2 | number | datetime / interval | raw | rowid, urowid | nchar, nvarchar2 | |
| char, varchar2 | X | X | X | X | X | |
| number | X | X | ||||
| datetime / interval | X | X | ||||
| Raw | X | X | ||||
| rowid, urowid | X | X | ||||
| nchar, nvarchar2 | X | X | X | X | X | |
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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