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
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: 07 April 2022