oracle 三表关联查询

CreationTime--2018年7月4日17点52分

Author:Marydon

左连接实现三表关联

表A---------------------------------关联第一张表B-----------------------关联第二张表c

1.语法

　　select * from 表名A left join 表B on A.columnX=B.columnM and A.columnY=B.columnN left join 表c on 表A=表c的id

2.应用场景

　　四张表 GJPT_BASY、GJZY_BASY、GJPT_BASY_ERROR、GJZY_BASY_ERROR
　　根据四张表，要求返回：医疗机构名称，医疗机构编号，总数，合格数和问题数

3.SQL实现

SELECT TEMP1.*, TEMP2.HEGESUM, TEMP3.TROUBLESUMFROM (SELECT T1.YLNAME, T1.YLCODE, SUM(RS1) AS YLSUM--总数FROM (SELECT COUNT(1) AS RS1,HDSD00_11_118 AS YLNAME,HDSD00_11_119 AS YLCODEFROM GJPT_BASYGROUP BY HDSD00_11_119, HDSD00_11_118UNION ALLSELECT COUNT(1) AS RS1,HDSD00_12_133 AS YLNAME,HDSD00_12_134 AS YLCODEFROM GJZY_BASYGROUP BY HDSD00_12_133, HDSD00_12_134UNION ALLSELECT COUNT(1) AS RS1,HDSD00_11_118 AS YLNAME,HDSD00_11_119 AS YLCODEFROM GJPT_BASY_ERRORGROUP BY HDSD00_11_119, HDSD00_11_118UNION ALLSELECT COUNT(1) AS RS1,HDSD00_12_133 AS YLNAME,HDSD00_12_134 AS YLCODEFROM GJZY_BASY_ERRORGROUP BY HDSD00_12_133, HDSD00_12_134) T1GROUP BY T1.YLNAME, T1.YLCODE) TEMP1LEFT JOIN (SELECT *FROM (SELECT T2.YLNAME, T2.YLCODE, SUM(RS2) AS HEGESUM--合格数FROM (SELECT COUNT(1) AS RS2,HDSD00_11_118 AS YLNAME,HDSD00_11_119 AS YLCODEFROM GJPT_BASYGROUP BY HDSD00_11_119, HDSD00_11_118UNION ALLSELECT COUNT(1) AS RS2,HDSD00_12_133 AS YLNAME,HDSD00_12_134 AS YLCODEFROM GJZY_BASYGROUP BY HDSD00_12_133, HDSD00_12_134) T2GROUP BY T2.YLNAME, T2.YLCODE)) TEMP2ON TEMP2.YLNAME = TEMP1.YLNAMEAND TEMP2.YLCODE = TEMP1.YLCODELEFT JOIN (SELECT *FROM (SELECT T3.YLNAME, T3.YLCODE, SUM(RS3) TROUBLESUM--问题数FROM (SELECT COUNT(1) AS RS3,HDSD00_11_118 AS YLNAME,HDSD00_11_119 AS YLCODEFROM GJPT_BASY_ERRORGROUP BY HDSD00_11_119, HDSD00_11_118UNION ALLSELECT COUNT(1) AS RS3,HDSD00_12_133 AS YLNAME,HDSD00_12_134 AS YLCODEFROM GJZY_BASY_ERRORGROUP BY HDSD00_12_133, HDSD00_12_134) T3GROUP BY T3.YLNAME, T3.YLCODE)) TEMP3ON TEMP3.YLNAME = TEMP1.YLNAMEAND TEMP3.YLCODE = TEMP1.YLCODEWHERE TEMP3.YLCODE='41580781841010511A1001';

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oracle 三表关联查询

oracle 三表关联查询

CreationTime--2018年7月4日17点52分

Author:Marydon

1.语法

2.应用场景

3.SQL实现

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