Question

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SQL: What does =* mean?

I am going through some legacy code and found a query like this:

SELECT * from foo_table, bar_Table where foo_table.id *= bar_table.fac_id

What does the *= operator do?

Answer 1

That is the old and no longer recommended way of specifying table joins.

The modern equivalent to what you’re seeing would be:

SELECT * 
FROM foo_table
LEFT JOIN bar_Table ON foo_table.id = bar_table.fac_id