Informally, a join stitches two tables and puts on the same row records with matching fields : INNER , LEFT OUTER , RIGHT OUTER , FULL OUTER and CROSS . A Venn ...
2023年6月20日 — What Is a LEFT OUTER JOIN? The most common JOIN is INNER JOIN . It's a join type that returns only the matching rows from both joined tables.
The LEFT JOIN keyword returns all records from the left table (table1), and the matching records from the right table (table2). The result is 0 records from the ...