Pichan,
Thursday, March 14, 2002, 6:19:23 AM, you wrote:
PM> I have 2 tables, let says, table A and table B. Each table record person
PM> name.
PM> select B.name from B, A where B.name = A.name
PM> Query above should return the name which recorded in both tables (duplicate
PM> name)
PM> In reverse, how can I retrive the name which recorded in Table B and not
PM> present in Table A?
PM> Table A
PM> name id
PM> ----------------------------------------
PM> Johnson | 1203
PM> Jack | 1192
PM> Mary | 5509
PM> Jimmy | 1189
PM> ----------------------------------------
PM> Table B
PM> name level
PM> ----------------------------------------
PM> Johnson | AA
PM> Mary | AC
PM> Alex | AA
PM> Chris | AA
PM> ----------------------------------------
PM> select B.name from B, A where B.name <> A.name
PM> this query not work as I expect, also with join
SELECT B.name from B LEFT JOIN A ON B.name=A.name where A.name IS
NULL;
You can find info about JOIN clause at:
http://www.mysql.com/doc/J/O/JOIN.html
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