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BOOLEAN
The BOOLEAN data type stores 1-byte values that evaluate to true, false, or unknown. The actual values that you can insert into a BOOLEAN column (or use as Boolean literals) are as follows:
| Accepted Values | Meaning | Return Value |
|---|---|---|
true, t, y, yes, 1 | True | t |
false, f, n, no, 0 | False | f |
null | Unknown | null |
Uppercase and lowercase values are accepted: TRUE or true, for example. Single quotes are required for all values except true, false, and null.
Parent topic:SQL Data Types