跳到主要内容

TRY_CAST

Convert a value from one data type to another data type. If error happens, return NULL.

Syntax

TRY_CAST(x AS t)

Arguments

ArgumentsDescription
xA value to convert.
tThe target data type.

Return Type

Nullable datatype of the target data type

Examples

SELECT try_cast(1 AS VARCHAR);
+-----------------------+
| try_cast(1 as String) |
+-----------------------+
| 1 |
+-----------------------+

SELECT try_cast('abc' AS INT UNSIGNED);
+---------------------------+
| try_cast('abc' as UInt32) |
+---------------------------+
| NULL |
+---------------------------+

SELECT typeof(try_cast('abc' AS INT UNSIGNED));
+-----------------------------------+
| typeof(try_cast('abc' as uint32)) |
+-----------------------------------+
| INT UNSIGNED NULL |
+-----------------------------------+