Home >Database >Mysql Tutorial >where and what cannot be used together in mysql
The WHERE clause cannot be used with the ORDER BY, GROUP BY, and HAVING clauses. These clauses must be applied in order: first WHERE, then GROUP BY, then HAVING, and finally ORDER BY.
Which statements cannot be used with the Where clause?
In MySQL, the WHERE clause is a clause used to filter query results based on specific conditions. It cannot be used with the following statements:
1. ORDER BY clause
The ORDER BY clause is used to sort the query results by the specified column. It must be placed after the WHERE clause, for example:
<code class="sql">SELECT * FROM table_name WHERE condition ORDER BY column_name;</code>
2. GROUP BY clause
The GROUP BY clause is used to group query results into specified columns . It must be placed after the WHERE clause, for example:
<code class="sql">SELECT column_name, COUNT(*) FROM table_name WHERE condition GROUP BY column_name;</code>
3. HAVING clause
The HAVING clause is used to apply additional conditions to grouped query results. It must be placed after the GROUP BY clause, for example:
<code class="sql">SELECT column_name, COUNT(*) FROM table_name WHERE condition GROUP BY column_name HAVING COUNT(*) > 10;</code>
The above is the detailed content of where and what cannot be used together in mysql. For more information, please follow other related articles on the PHP Chinese website!