Hi, This is my first post here so forgive me if its too simple or not right.
basically what i do is: SELECT COUNT(*) FROM table1 where cno=3; (and dumping it into a variable $theResult - I am using PHP) and it gives me the result, but now i need to do this in 5 tables...
I can of course run 5 count statements but was wondering if I can do the whole thing in one statement? A friend of mine told me to try "union" but when i go to the documentation of union I cant understand much and it says "UNION is implemented in MySQL 4.0.0" I have no idea what version i have.
SHOW VARIABLES LIKE 'version'
The 5 tables are pretty much the same and have the same "cno" field that i need and are named table1,table2,table3,table4,table5
SELECT COUNT(*) FROM table1 WHERE cno = 3 UNION SELECT COUNT(*) FROM table2 WHERE cno = 3 UNION SELECT COUNT(*) FROM table3 WHERE cno = 3 UNION SELECT COUNT(*) FROM table4 WHERE cno = 3 UNION SELECT COUNT(*) FROM table5 WHERE cno = 3
this will return 5 rows in result, f.e.:
COUNT(*) -------- 12 10 9 23 7
if you want all COUNTS as one row then you have to use f.e. MERGE table type (http://www.mysql.com/doc/en/MERGE.html)
SELECT COUNT(*) FROM tablemerge WHERE cno = 3
this would return f.e:
COUNT(*) -------- 61
Can anybody help me please? Thanks in advance.
cheers, -Ryan
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