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CAST

Convert a value from one data type to another data type.

Syntax​

CAST(x AS t)
x::t

Arguments​

ArgumentsDescription
xA value to convert.
tThe target data type.

Return Type​

Converted value.

Examples​

mysql> SELECT CAST(1 AS VARCHAR);
+-------------------+
| cast(1 as String) |
+-------------------+
| 1                 |
+-------------------+

mysql> select 1::varchar;
+-----------+
| 1::String |
+-----------+
| 1         |
+-----------+
1 row in set (0.014 sec)

mysql> SELECT CAST(1 AS UInt64);
+-------------------+
| cast(1 as UInt64) |
+-------------------+
|                 1 |
+-------------------+

mysql> SELECT toTypeName(CAST(1 AS UInt64));
+-------------------------------+
| toTypeName(cast(1 as UInt64)) |
+-------------------------------+
| UInt64                        |
+-------------------------------+