Boolean (Logical) Values
PostgreSQL supports a single Boolean (or logical) data type: BOOLEAN (BOOLEAN can be abbreviated as BOOL).
Size and Valid Values
A BOOLEAN can hold the values TRUE, FALSE, or NULL, and consumes a single byte of storage.
Syntax for Literal Values
Table 2.16 shows the alternate spellings for BOOLEAN literals.
|
Common Name |
Synonyms |
|---|---|
|
TRUE |
true, 't', 'y', 'yes', 1 |
|
FALSE |
false, 'f', 'n', 'no', 0 |
Supported Operators
The only operators supported for the BOOLEAN data type are the logical operators shown in Table 2.17:
|
Data Types |
Valid Operators (q) |
|---|---|
|
BOOLEAN q BOOLEAN |
AND OR NOT |
I covered the AND, OR, and NOT operators in Chapter 1. For a complete definition of these operators, see Tables 1.3, 1.4, and 1.5.
