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SQL for joining two tables

What is the SQL statement that can be used to join two tables?

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You will be joining the two tables on one or more columns. In Oracle, I can code the join operation similar to the following: 
SELECT tableA.columnA, tableA.columnB, tableB.columnX, tableB.columnY
FROM tableA, tableB
WHERE tableA.columnA = tableB.columnX AND tableA.columnB = tableB.columnY;
In the same above, the rows from the two tables are joined where ColumnA = ColumnX and ColumnB = ColumnY. You can code any join condition this way. Oracle also supports the ANSI SQL standard join syntax. The above query in ANSI SQL standard would look like the following: 
SELECT tableA.columnA, tableA.columnB, tableB.columnX, tableB.columnY
FROM tableA INNER JOIN tableB
ON tableA.columnA = tableB.columnX AND tableA.columnB = tableB.columnY;

This was first published in March 2006

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