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The snippet library.
Small, practical examples. Search by task or narrow things down below.
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Undo only the work after a savepoint
SQL: After committing the fixtures, roll back a trial change while keeping earlier work in the second transaction.
SQL✓ Tested
Update one matching row
Change a value with an explicit filter.
UPDATE✓ Tested
Update one row using its primary key
SQL: Use a precise WHERE condition to change only the intended row in a scratch table.
SQL✓ Tested
Update rows selected by a related table
SQL: Use EXISTS to limit updates based on an independent eligibility table.
SQL✓ Tested
Update several classifications in one statement
SQL: A CASE expression computes the new value for each row covered by the update predicate.
SQL✓ Tested