Question

我有两个表emp和prj。表的列和数据类型如下：Emp具有EmpNo（INT），EmpITPrj（STR），EmpFinPrj（STR），EmpHRPrj（STR），EmpIntPrj（STR），EmpDate（STR）和 prj具有PrjID（STR），PrjStartDate（STR），PrjEndDate（STR）。目标是显示与条件prj.PrjID匹配的所有记录在emp.EmpITPrj，emp.EmpFinPrj，emp.EmpHRPrj或emp.EmpIntPrj的列之一中，并且emp.Date落在prj.PrjStartDate，prj上或之间.PrjEndDate。


EmpNo   EmpITPrj    EmpFinPrj   EmpHRPrj    EmpIntPrj   Date
1         IT101       null        null         null     2019-09-01
2         null        Fin101      null         null     2001-06-05
3         null        Fin102      null         null     2005-11-25
4         null        null        null         Int501   2010-10-15
5         null        null        null         Int105   2019-01-10
6         null        null        null         Int444   2015-12-03
7         null        null        HR110        null     2012-08-19
8         IT101       null        null         null     2011-04-24
9         null        null        HR105        null     2005-02-09
10        IT102       null        null         null     2006-07-11



PrjID   PrjStartDate    PrjEndDate
Fin102  10/14/2005      12/14/2005
IT102   07/11/2006      10/30/2006
IT110   11/15/2010      01/31/2011
Int101  01/01/2015      03/31/2015
HR110   05/19/2012      08/19/2012
Int444  01/01/2015      03/01/2015

End Result:
EmpNo   EmpITPrj    EmpFinPrj   EmpHRPrj    EmpIntPrj   EmpDate     PrjID   PrjStartDate    PrjEndDate
3       null        Fin102      null        null        2005-11-25  Fin102  10/14/2005      12/14/2005
10      IT102       null        null        null        2006-07-11  IT102   07/11/2006      10/30/2006
7       null        null        HR110       null        2012-08-19  HR110   05/19/2012      08/19/2012

我正在尝试的当前查询不会产生任何结果。谁能建议我该如何进行此查询？

SELECT
 *
FROM
  `bigquery-project-123.emp` AS t1,
  `bigquery-project-123.prj` t2
WHERE
  (t1.EmpITPrj = t2.PrjID
    OR t1.EmpFinPrj = t2.PrjID
    OR t1.EmpHRPrj = t2.PrjID
    OR t1.EmpIntPrj = t2.PrjID
  AND SAFE.PARSE_DATE("%Y%m%d", t1.Date) >= SAFE.PARSE_DATE("%Y%m%d",t2.PrjStartDate)
    AND SAFE.PARSE_DATE("%Y%m%d", t1.Date) <= SAFE.PARSE_DATE("%Y%m%d",t2.PrjEndDate)

Answer 1

以下是用于BigQuery标准SQL

#standardSQL
WITH `bigquery-project-123.emp` AS (
  SELECT 1 EmpNo, 'IT101' EmpITPrj, NULL EmpFinPrj, NULL EmpHRPrj, NULL EmpIntPrj, '2019-09-01' EmpDate union all
  SELECT 2, NULL, 'Fin101', NULL, NULL, '2001-06-05' union all
  SELECT 3, NULL, 'Fin102', NULL, NULL, '2005-11-25' union all
  SELECT 4, NULL, NULL, NULL, 'Int501', '2010-10-15' union all
  SELECT 5, NULL, NULL, NULL, 'Int105', '2019-01-10' union all
  SELECT 6, NULL, NULL, NULL, 'Int444', '2015-12-03' union all
  SELECT 7, NULL, NULL, 'HR110', NULL, '2012-08-19' union all
  SELECT 8, 'IT101', NULL, NULL, NULL, '2011-04-24' union all
  SELECT 9, NULL, NULL, 'HR105', NULL, '2005-02-09' union all
  SELECT 10, 'IT102', NULL, NULL, NULL, '2006-07-11' 
), `bigquery-project-123.prj` AS (
  SELECT 'Fin102' PrjID, '10/14/2005' PrjStartDate, '12/14/2005' PrjEndDate union all
  SELECT 'IT102', '07/11/2006', '10/30/2006' union all
  SELECT 'IT110', '11/15/2010', '01/31/2011' union all
  SELECT 'Int101', '01/01/2015', '03/31/2015' union all
  SELECT 'HR110', '05/19/2012', '08/19/2012' union all
  SELECT 'Int444', '01/01/2015', '03/01/2015' 
)
SELECT *
FROM `bigquery-project-123.emp` AS t1
JOIN `bigquery-project-123.prj` t2 
ON t2.PrjID IN (t1.EmpITPrj,t1.EmpFinPrj,t1.EmpHRPrj,t1.EmpIntPrj)
AND SAFE.PARSE_DATE("%Y-%m-%d", t1.EmpDate) BETWEEN 
SAFE.PARSE_DATE("%m/%d/%Y",t2.PrjStartDate) AND SAFE.PARSE_DATE("%m/%d/%Y",t2.PrjEndDate)

有结果

Row EmpNo   EmpITPrj    EmpFinPrj   EmpHRPrj    EmpIntPrj   EmpDate     PrjID   PrjStartDate    PrjEndDate   
1   3       null        Fin102      null        null        2005-11-25  Fin102  10/14/2005      12/14/2005   
2   7       null        null        HR110       null        2012-08-19  HR110   05/19/2012      08/19/2012   
3   10      IT102       null        null        null        2006-07-11  IT102   07/11/2006      10/30/2006

如何通过在bigquery中将一个表中的id与另一表中的多列中的id连接在一起来获取记录？

1 个答案: