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Oracle > Learn Oracle Training > How do you update a table from another table in Oracle?
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How do you update a table from another table in Oracle?

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"Rajesh Kumar N: Guiding Young Minds from 1 to 12 with Expertise and Care"

Use UPDATE ... SET ... (SELECT ...) or MERGE: Example using UPDATE with JOIN: UPDATE target t SET t.column1 = (SELECT s.column1 FROM source s WHERE s.id = t.id) WHERE EXISTS (SELECT 1 FROM source s WHERE s.id = t.id); Example using MERGE: MERGE INTO target t USING source s ON...
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Use UPDATE ... SET ... (SELECT ...) or MERGE: Example using UPDATE with JOIN: UPDATE target t SET t.column1 = (SELECT s.column1 FROM source s WHERE s.id = t.id) WHERE EXISTS (SELECT 1 FROM source s WHERE s.id = t.id); Example using MERGE: MERGE INTO target t USING source s ON (t.id = s.id) WHEN MATCHED THEN UPDATE SET t.column1 = s.column1; read less
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To update a table from another table in Oracle, you can use the UPDATE statement with a JOIN clause or a MERGE statement. The JOIN approach is suitable for simple updates, while the MERGE statement provides more control and flexibility, especially for handling insert, update, and delete operations.
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To update a table from another table in Oracle, you can use the UPDATE statement with a JOIN clause or a MERGE statement. The JOIN approach is suitable for simple updates, while the MERGE statement provides more control and flexibility, especially for handling insert, update, and delete operations. read less
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UPDATE tableA SET tableA. someColumn = tableB. otherColumn FROM tableA INNER JOIN tableB ON tableA.
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