# Query operators

[Read this page in HTML](https://www.scopedb.io/docs/reference/commands/query-operators)

Use operators to build expressions or combine query results.

| Category                                                                                             | Operators                             |
| ---------------------------------------------------------------------------------------------------- | ------------------------------------- |
| [Arithmetic operators](https://www.scopedb.io/docs/reference/commands/query-operators/arithmetic.md) | `+`, `-`, `*`, `/`, `%`               |
| [Comparison operators](https://www.scopedb.io/docs/reference/commands/query-operators/comparison.md) | `=`, `!=`, `<>`, `>`, `<`, `>=`, `<=` |
| [Logical operators](https://www.scopedb.io/docs/reference/commands/query-operators/logical.md)       | `AND`, `OR`, `XOR`, `NOT`             |
| [Set operators](https://www.scopedb.io/docs/reference/commands/query-operators/set.md)               | `UNION ALL`                           |