ORACLE-SQL(二)

一、SQL语句

  (二)提升篇

    1.2.3 分页,分组,计数,排序

/**
* 返回数据
* FORGID 医疗机构ID
* FRCODE 县区编码
* FORGNAME 医疗机构名称
* FCENNAME_TEM_COUNT 名称不对称计数
* ISNULLCENCODE_COUNT 未对照计数
* TOTALCOUNT L_DIAITEM_ERROR表中共有多少条数据
*/
SELECT T3.*
FROM (SELECT T2.*, ROWNUM ROWNO
      FROM (SELECT T.FORGID,
                   T1.FRCODE,
                   T1.FORGNAME,
                   SUM(NVL(T.NCCW, 0)) FCENNAME_TEM_COUNT,
                   SUM(NVL(T.WDZ, 0)) ISNULLCENCODE_COUNT,
                   TOTALCOUNT
             FROM L_DIAITEM_ERROR T, TORGANIZATION T1
             WHERE T.FORGID = T1.FORGID
             GROUP BY T.FORGID, T1.FORGNAME, T1.FORGSEQ, T1.FRCODE
             ORDER BY T1.FORGSEQ) T2
     WHERE ROWNUM <= V_END) T3
WHERE T3.ROWNO >= V_START;

    注意:

      a.TOTALCOUNT是已存在的一个变量,这里不作为关注重点;      

      b.被group by的数据,要想查询表中的某个字段,有且只有两种方式:

        方式一:

          在group by 后面加上想要查询出来的字段      

        方式二:

          对于数字列,使用求和函数sum()实现查询

      否则,会报错:不是group by 表达式      

    CreateTime--2017年1月20日17:19:04

    1.2.4 不同数据库间建立连接

      情景:一个库访问另一个库的某张表

    UpdateTime--2017年7月17日16:02:26

     1.2.7 将查询的计数结果列转行

    实例:对两表满足条件的数据进行计数,并横向展示查询结果

      sql1:纵向展示(雏形)

SELECT COUNT(1) COUNTRESULT
  FROM CONSULT_INFO T
 WHERE T.CON_ORG_ID = '134557'
   AND T.CONSULT_STATUS = 0
UNION ALL
SELECT COUNT(1) COUNTRESULT
  FROM OUTPATIENT_CONSULT_INFO T2
 WHERE T2.CON_ORG_ID = '134557'
   AND T2.CONSULT_STATUS = 0

      查询结果:

      sql2:两行两列展示

SELECT COUNT(1) AS COUNTRESULT1, 0 AS COUNTRESULT2
  FROM CONSULT_INFO T
 WHERE T.CON_ORG_ID = '134557'
   AND T.CONSULT_STATUS = 0
UNION ALL
SELECT 0 AS COUNTRESULT1, COUNT(1) AS COUNTRESULT2
  FROM OUTPATIENT_CONSULT_INFO T2
 WHERE T2.CON_ORG_ID = '134557'
   AND T2.CONSULT_STATUS = 0

      查询结果:

      sql3:最终实现

SELECT SUM(COUNTRESULT1) COUNTRESULT1, SUM(COUNTRESULT2) COUNTRESULT2
  FROM (SELECT COUNT(1) AS COUNTRESULT1, 0 AS COUNTRESULT2
          FROM CONSULT_INFO T
         WHERE T.CON_ORG_ID = '134557'
           AND T.CONSULT_STATUS = 0
        UNION ALL
        SELECT 0 AS COUNTRESULT1, COUNT(1) AS COUNTRESULT2
          FROM OUTPATIENT_CONSULT_INFO T2
         WHERE T2.CON_ORG_ID = '134557'
           AND T2.CONSULT_STATUS = 0)

 

      查询结果:

 

写在最后

  哪位大佬如若发现文章存在纰漏之处或需要补充更多内容,欢迎留言!!!

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posted @ 2017-06-01 15:07  Marydon  阅读(594)  评论(0编辑  收藏  举报