Boolean Data Types

Table 1 Boolean types

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', 'FALSE', false, 0

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

Example

Boolean values are displayed using the letters t and f.

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

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

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

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

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

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