sql统计某年的12个月工做数据

SELECT p.proj_no AS pno, p.proj_name AS pname, w.work_name AS wname, wt.work_id AS wid, wt. YEAR, sum( CASE wt.MONTH WHEN 1 THEN wt.work_time ELSE 0 END )AS january, sum( CASE wt. MONTH WHEN 2 THEN wt

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