AS_BOOLEAN¶

Syntax¶

AS_BOOLEAN( <variant_expr> )

Arguments¶

variant_expr

An expression that evaluates to a value of type VARIANT.

Returns¶

The function returns a value of type BOOLEAN or NULL:

• If the type of the value in the variant_expr argument is BOOLEAN, the function returns a value of type BOOLEAN.

• If the type of the value in the variant_expr argument doesn’t match the type of the output value, the function returns NULL.

• If the variant_expr argument is NULL, the function returns NULL.

Examples¶

Create a table and load data into it:

CREATE OR REPLACE TABLE as_boolean_example (
  boolean1 VARIANT,
  boolean2 VARIANT);

INSERT INTO as_boolean_example (boolean1, boolean2)
  SELECT
    TO_VARIANT(TO_BOOLEAN(TRUE)),
    TO_VARIANT(TO_BOOLEAN(FALSE));

Use the AS_BOOLEAN function in a query to cast VARIANT values to BOOLEAN values:

SELECT AS_BOOLEAN(boolean1) boolean_true,
       AS_BOOLEAN(boolean2) boolean_false
  FROM as_boolean_example;

+--------------+---------------+
| BOOLEAN_TRUE | BOOLEAN_FALSE |
|--------------+---------------|
| True         | False         |
+--------------+---------------+