Boolean Types

**Table 1** Boolean types
Name	Description	Storage Space	Value
BOOLEAN	Boolean type	1 byte	true false null (unknown)

Valid literal values for the "true" state include:
TRUE, 't', 'true', 'y', 'yes', '1', 'TRUE', true, and an integer ranging from 1 to 2^63 – 1 or from –1 to –2^63.
Valid literal values for the "false" state include:
FALSE, 'f', 'false', 'n', 'no', '0', 0, 'FALSE', and false.

TRUE and FALSE are standard expressions, compatible with SQL statements.

Examples

Boolean values are displayed using the letters t and f.

    
         -- Create a table.
openGauss=# CREATE TABLE bool_type_t1  
(
    BT_COL1 BOOLEAN,
    BT_COL2 TEXT
);

-- Insert data.
openGauss=# INSERT INTO bool_type_t1 VALUES (TRUE, 'sic est');

openGauss=# INSERT INTO bool_type_t1 VALUES (FALSE, 'non est');

-- View data.
openGauss=# SELECT * FROM bool_type_t1;
 bt_col1 | bt_col2 
---------+---------
 t       | sic est
 f       | non est
(2 rows)

openGauss=# SELECT * FROM bool_type_t1 WHERE bt_col1 = 't';
 bt_col1 | bt_col2 
---------+---------
 t       | sic est
(1 row)

-- Delete the table.
openGauss=# DROP TABLE bool_type_t1;