sql查詢每一個季度的數據並自動補零

對錶中每一個季度的數據進行統計並實現自動補零，首先先查詢出表中每一個季度的數據sql SELECT QUARTER(applicationdate) as mon, COUNT(*) as con FROM qm_technical_zero GROUP BY QUARTER(applicationdate) 從表qm_technical_zero中按季度查詢日期applicationdate的數

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