Title: WP_Tax_Query::get_sql_clauses
Published: December 18, 2014
Last modified: April 28, 2025

---

# WP_Tax_Query::get_sql_clauses(): string[]

## In this article

 * [Description](https://developer.wordpress.org/reference/classes/wp_tax_query/get_sql_clauses/?output_format=md#description)
 * [Return](https://developer.wordpress.org/reference/classes/wp_tax_query/get_sql_clauses/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/classes/wp_tax_query/get_sql_clauses/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/classes/wp_tax_query/get_sql_clauses/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/classes/wp_tax_query/get_sql_clauses/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/classes/wp_tax_query/get_sql_clauses/?output_format=md#wp--skip-link--target)

Generates SQL clauses to be appended to a main query.

## 󠀁[Description](https://developer.wordpress.org/reference/classes/wp_tax_query/get_sql_clauses/?output_format=md#description)󠁿

Called by the public [WP_Tax_Query::get_sql()](https://developer.wordpress.org/reference/classes/wp_tax_query/get_sql/),
this method is abstracted out to maintain parity with the other Query classes.

## 󠀁[Return](https://developer.wordpress.org/reference/classes/wp_tax_query/get_sql_clauses/?output_format=md#return)󠁿

 string[] Array containing JOIN and WHERE SQL clauses to append to the main query.

 * `join` string
 * SQL fragment to append to the main JOIN clause.
 * `where` string
 * SQL fragment to append to the main WHERE clause.

## 󠀁[Source](https://developer.wordpress.org/reference/classes/wp_tax_query/get_sql_clauses/?output_format=md#source)󠁿

    ```php
    protected function get_sql_clauses() {
    	/*
    	 * $queries are passed by reference to get_sql_for_query() for recursion.
    	 * To keep $this->queries unaltered, pass a copy.
    	 */
    	$queries = $this->queries;
    	$sql     = $this->get_sql_for_query( $queries );

    	if ( ! empty( $sql['where'] ) ) {
    		$sql['where'] = ' AND ' . $sql['where'];
    	}

    	return $sql;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/class-wp-tax-query.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/class-wp-tax-query.php#L269)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-tax-query.php#L269-L282)

## 󠀁[Related](https://developer.wordpress.org/reference/classes/wp_tax_query/get_sql_clauses/?output_format=md#related)󠁿

| Uses | Description | 
| [WP_Tax_Query::get_sql_for_query()](https://developer.wordpress.org/reference/classes/wp_tax_query/get_sql_for_query/)`wp-includes/class-wp-tax-query.php` |

Generates SQL clauses for a single query array.

  |

| Used by | Description | 
| [WP_Tax_Query::get_sql()](https://developer.wordpress.org/reference/classes/wp_tax_query/get_sql/)`wp-includes/class-wp-tax-query.php` |

Generates SQL clauses to be appended to a main query.

  |

## 󠀁[Changelog](https://developer.wordpress.org/reference/classes/wp_tax_query/get_sql_clauses/?output_format=md#changelog)󠁿

| Version | Description | 
| [4.1.0](https://developer.wordpress.org/reference/since/4.1.0/) | Introduced. |

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