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I've inherited a (MS SQL 2008R2) project that, amongst other things, does a table update from another table:
Table1 (with around 150,000 rows) has 3 phone number fields (Tel1,Tel2,Tel3)
Table2 (with around 20,000 rows) has 3 phone number fields (Tel1,Tel2,Tel3)
.. and when any of those number...