Question

首先我是一名程序员，我没有开设任何SQL课程，并且自学成才。我想要的所有数据都很好，但是我在日期字段上设置了MAX，并且仍然为我提供了表格中的所有日期。我只想要最新的。我也有多个联接，所以我确定设置不正确。任何帮助将不胜感激。

我正在使用Pentaho作为作家

SELECT DISTINCT
     "RPT_CLIENT_PAYER_PLAN"."PAYER_PLAN_NAME",
     "RPT_CLIENT"."CLIENT_NUMBER",
     "RPT_CLIENT_PROGRAMS"."PROGRAM_ID",
     "RPT_CLIENT_DSM5_DIAG"."DSM5_P1_CODE",
     "RPT_CLIENT_DSM5_DIAG"."DSM5_P1_DESCRIPTION",
     "RPT_CLIENT_DSM5_DIAG"."DSM5_P2_CODE",
     "RPT_CLIENT_DSM5_DIAG"."DSM5_P2_DESCRIPTION",
     "RPT_CLIENT_DSM5_DIAG"."DSM5_P3_CODE",
     "RPT_CLIENT_DSM5_DIAG"."DSM5_P3_DESCRIPTION",
     "RPT_CLIENT_PROGRAMS"."PROGRAM",
     "RPT_CLIENT_PROGRAMS"."BEGIN_DATE",
     "RPT_CLIENT"."AGE",
     "RPT_CLIENT"."GENDER",
     "RPT_CLIENT"."MILITARY_SERVICES",
     "RPT_CLIENT"."MILITARY_STATUS",
     "RPT_SVCDOC_TOBACCO"."SMOKING_STATUS",
     "RPT_SVCDOC_REFERRAL"."REFER_COMMENT",
     "RPT_SVCDOC_REFERRAL"."REASON_FOR_REFERRAL",
     "RPT_CLIENT_PAYER_PLAN"."END_DATE",
     "RPT_CLIENT_PROGRAMS"."END_DATE",
     MAX("RPT_CLIENT_DSM5_DIAG"."EFFECTIVE_DATE") as max_date
FROM
     "RPT_CLIENT_PROGRAMS" INNER JOIN "RPT_CLIENT" ON "RPT_CLIENT_PROGRAMS"."CLIENT_ID" = "RPT_CLIENT"."CLIENT_ID"
     INNER JOIN "RPT_CLIENT_DSM5_DIAG" ON "RPT_CLIENT_PROGRAMS"."CLIENT_ID" = "RPT_CLIENT_DSM5_DIAG"."CLIENT_ID"
     INNER JOIN "RPT_CLIENT_PAYER_PLAN" ON "RPT_CLIENT_DSM5_DIAG"."CLIENT_ID" = "RPT_CLIENT_PAYER_PLAN"."CLIENT_ID"
     INNER JOIN "RPT_SVCDOC_TOBACCO" ON "RPT_CLIENT_PAYER_PLAN"."CLIENT_ID" = "RPT_SVCDOC_TOBACCO"."CLIENT_ID"
     INNER JOIN "RPT_SVCDOC_REFERRAL" ON "RPT_CLIENT"."CLIENT_NUMBER" = "RPT_SVCDOC_REFERRAL"."CLIENT_NUMBER"
WHERE
     "RPT_CLIENT_PROGRAMS"."PROGRAM_ID" IN (1087)
     and "RPT_CLIENT_PROGRAMS"."BEGIN_DATE" >= ${Begin_Date}
     and "RPT_CLIENT_PAYER_PLAN"."END_DATE" IS NULL

GROUP BY
    "RPT_CLIENT_PAYER_PLAN"."PAYER_PLAN_NAME",
     "RPT_CLIENT"."CLIENT_NUMBER",
     "RPT_CLIENT_PROGRAMS"."PROGRAM_ID",
     "RPT_CLIENT_DSM5_DIAG"."DSM5_P1_CODE",
     "RPT_CLIENT_DSM5_DIAG"."DSM5_P1_DESCRIPTION",
     "RPT_CLIENT_DSM5_DIAG"."DSM5_P2_CODE",
     "RPT_CLIENT_DSM5_DIAG"."DSM5_P2_DESCRIPTION",
     "RPT_CLIENT_DSM5_DIAG"."DSM5_P3_CODE",
     "RPT_CLIENT_DSM5_DIAG"."DSM5_P3_DESCRIPTION",
     "RPT_CLIENT_PROGRAMS"."PROGRAM",
     "RPT_CLIENT_PROGRAMS"."BEGIN_DATE",
     "RPT_CLIENT"."AGE",
     "RPT_CLIENT"."GENDER",
     "RPT_CLIENT"."MILITARY_SERVICES",
     "RPT_CLIENT"."MILITARY_STATUS",
     "RPT_SVCDOC_TOBACCO"."SMOKING_STATUS",
     "RPT_SVCDOC_REFERRAL"."REFER_COMMENT",
     "RPT_SVCDOC_REFERRAL"."REASON_FOR_REFERRAL",
     "RPT_CLIENT_PAYER_PLAN"."END_DATE",
     "RPT_CLIENT_PROGRAMS"."END_DATE",
     "RPT_CLIENT_DSM5_DIAG"."EFFECTIVE_DATE"

希望只获得最新的DMS-5生效日期，但仍然给我一切。

Answer 1

您在max列上有EFFECTIVE_DATE，但它也是group by的一部分。由于它是分组依据的一部分，因此该列的每个唯一值都将单独显示。从group by删除它，它应该可以工作。

最新日期字段

1 个答案: