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每月彙整:三月 2014
MySQL SUM總和為NULL問題
SELECT SUM(salary) FROM myTable WHERE user = ‘Power’ SELECT COALESCE(SUM(salary),0) FROM myTable WHERE user = ‘Power’
SELECT SUM(salary) FROM myTable WHERE user = ‘Power’ SELECT COALESCE(SUM(salary),0) FROM myTable WHERE user = ‘Power’