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How to express inequality in sql

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Release: 2024-04-29 14:27:14
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The syntax for expressing inequality in SQL is "!=". Its usage is: column name != value. Additionally, you can use "<>" instead of "!=", and for NULL values, use IS NULL or IS NOT NULL for comparison. In the WHERE clause, multiple not-equal conditions can be concatenated to form complex queries.

How to express inequality in sql

The syntax for expressing not equal in SQL

In SQL, use the "!=" operator to express not equal equal.

Usage:

<code class="sql">列名 != 值</code>
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For example:

<code class="sql">SELECT * FROM table_name WHERE column_name != 'value';</code>
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Other notes:

  • You can use "<>" instead of "!=".
  • For NULL values, use IS NULL or IS NOT NULL to compare.
  • For numeric comparisons, you can also use the "<", ">", "<=", ">=" operators.
  • When using "!=" in the WHERE clause, multiple conditions can be connected to form a complex query.

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