SQL UPDATE: Difference between revisions
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UPDATE person SET name = 'Binh Ngo Jr.' WHERE id = 1; | UPDATE person SET name = 'Binh Ngo Jr.', city = 'San Francisco' WHERE id = 1; | ||
</syntaxhighlight> | </syntaxhighlight> | ||
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The <code>UPDATE</code> statement may contain a <code>WHERE</code> clause, that identifies the rows to be modified: {{Internal|SQL_WHERE#Overview|The <tt>WHERE</tt> Clause}} | The <code>UPDATE</code> statement may contain a <code>WHERE</code> clause, that identifies the rows to be modified: {{Internal|SQL_WHERE#Overview|The <tt>WHERE</tt> Clause}} | ||
=Conditional <tt>UPDATE</tt>= | |||
<syntaxhighlight lang='sql'> | |||
UPDATE customer | |||
SET active = | |||
CASE | |||
WHEN 90 <= (SELECT datediff(now(), max(rental_date)) | |||
FROM rental r | |||
WHERE r.customer_id = customer.customer_id) | |||
THEN 0 | |||
ELSE 1 | |||
END | |||
WHERE active = 1; | |||
</syntaxhighlight> | |||
Also see: {{Internal|SQL_Conditional_Logic#Overview|SQL Conditional Logic}} | |||
Latest revision as of 21:14, 30 May 2024
Internal
Overview
UPDATE person SET name = 'Binh Ngo Jr.', city = 'San Francisco' WHERE id = 1;
PostgreSQL MySQL
The UPDATE statement may contain a WHERE clause, that identifies the rows to be modified:
Conditional UPDATE
UPDATE customer
SET active =
CASE
WHEN 90 <= (SELECT datediff(now(), max(rental_date))
FROM rental r
WHERE r.customer_id = customer.customer_id)
THEN 0
ELSE 1
END
WHERE active = 1;
Also see: