Code Inspection: Check using clause columns

Reports columns in the USING clause that does not exist in both tables.

Example (MySQL):

CREATE TABLE t1 (i INT, j INT);
CREATE TABLE t2 (k INT, l INT);
SELECT * FROM t1 JOIN t2 USING (j);

In USING clauses, a column name must be present in both tables, and the SELECT query will automatically join those tables by using the given column name. As we do not have the j column in t2, we can rewrite the query using ON. The ON clause can join tables where the column names do not match in both tables.

SELECT * FROM t1 JOIN t2 ON t1.j = t2.l;

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Last modified: 13 May 2022