Boolean Types

Table 1 lists the Boolean types supported by GaussDB.

**Table 1** Boolean Types
Name	Description	Storage Space	Value
BOOLEAN	Boolean	1 byte	true false null: unknown

Valid literal values for the "true" state are:
TRUE, 't', 'true', 'y', 'yes', '1', 'TRUE', true, on, and all non-zero values.
Valid literal values for the "false" state include:
FALSE, 'f', 'false', 'n', 'no', '0', 0, 'FALSE', false, and off.

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

Examples

Boolean values are displayed using the letters t and f.

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

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

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

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

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

-- Drop the table.
gaussdb=# DROP TABLE bool_type_t1;