Where Clause Performance
Posted by:
Manhao Chen
Date: September 17, 2014 09:10PM
2 Questions from me here
SELECT *
FROM _tbl_customer_
SELECT *
FROM _tbl_customer_
WHERE 1=1
would there be a speed/performance between the above 2 statement
reason i'm asking that i'm writing a SP which looks like this
SELECT *
FROM _tbl_customer_
WHERE IF(inputParameter1 IS NULL, 1=1, _tbl_customer_.deleted = inputParameter1)
wanting to write a SP and will query the table accordingly
so the goal is..
inputParameter1 = null : return all records of the table
inputParameter1 = 1 : only return records that are flag for delete
inputParameter1 = 0 : only return all live records
hope this makes sense, anyone know the best approach?
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Where Clause Performance
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