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Count Total Rows


I have a query and a loop where I output the results. Something like this:

PHP Code:
SELECT
     t1.var1,
     t1.var2,
     t2.var1,
     t2.var2
FROM t1
LEFT JOIN t2 ON (t1.id= t2.id)
WHERE
     t1.var1 = $value

I need to count what's the total number of rows I output.




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