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What’s the difference between this:
SELECT *
FROM table1, table2
WHERE table1.primary_id = table2.primary_id
And this:
SELECT *
FROM table1
FULL JOIN table2 ON table1.primary_id = table2.primary_id
The first query is an implicit
INNER JOIN, you should always use the explicit syntax. In that case, the query will return the records that are in table1 and in table2. The second query will return all the records of both tables, showingNULLif there are no match on the other.