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> Mirror of <https://developer.salesforce.com/docs/data/data-cloud-query-guide/references/dc-sql-reference/boolean.html> (Salesforce, Data 360 Query Guide), read 2026-10-23. Salesforce's own page is the authority; this copy exists because that site refuses non-browser readers.

## Boolean Type

**Applies to:** ✅ Data 360 SQL ✅ Tableau Hyper API

The `boolean` type can have three states: true, false, and unknown. The SQL `NULL` value represents unknown. You can represent boolean constants in SQL queries with the SQL key words `TRUE`, `FALSE`, and `NULL`.

A [comparison](https://developer.salesforce.com/docs/data/data-cloud-query-guide/references/dc-sql-reference/comparison-func.html) or a similar function call can result in a boolean value. You can also use [logical operators](https://developer.salesforce.com/docs/data/data-cloud-query-guide/references/dc-sql-reference/logical.html) to combine boolean values.

To parse a `boolean` from a string, use one of these strings.

| True | False |
| --- | --- |
| `true` | `false` |
| `yes` | `no` |
| `on` | `off` |
| `1` | `0` |
| `t` | `f` |
| `y` | `n` |

Data 360 SQL ignores leading or trailing whitespace and isn’t case-sensitive. To use the string representations, provide the generic string-literal constant syntax. For example, ‘yes’::boolean.

Data 360 SQL can’t automatically infer the type of `NULL` literals. To prevent errors, explicitly cast `NULL` to `boolean`. For example, `NULL::boolean`.

Converting a `boolean` to a string always emits either `true` or `false`, as shown in this example.

The table `test1` is defined as:

| a | b |
| --- | --- |
| true | sic est |
| false | non est |

Column `a` is a boolean value and column `b` is a text value.

Results:

| a | b |
| --- | --- |
| true | sic est |
| false | non est |

Results:

| a | b |
| --- | --- |
| true | sic est |


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