Friday, January 17, 2025

What is the best SQL query to check if any row exists in a table?

 To check if any row exists in a table, the best SQL query would be:

SELECT 1
FROM your_table
LIMIT 1;

Explanation:

  • This query checks if any row exists in the table your_table without needing to return all the rows.
  • LIMIT 1 ensures that only one row is checked, which improves efficiency.
  • SELECT 1 is used because we are only interested in whether any row exists, not in the actual data.

Alternatively, you can use:

SELECT EXISTS(SELECT 1 FROM your_table LIMIT 1);

This query returns a boolean (true or false) indicating whether at least one row exists in the table.

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