在 BigQuery SQL 中：检查和更新 table 列值以满足日期约束

Question

有一个 bigquery table 结构如下：

Store       Product     Weekbegindate   Weekenddate     Datevalidfrom   Datevalidto     IP      Unit
11          AA          2021-02-24      2021-03-02      null            null            null    7.7
11          BB          2021-02-10      2021-02-16      2021-04-17      2021-12-01      44      59.9
11          CC          2021-06-09      2021-06-15      2021-06-03      2021-06-24      03      6.5

我需要更新“Unit”列以满足两个条件， 1. 检查“IP”是否为 NOT NULL 并验证从“Weekbegindate”开始以“Weekenddate”结尾的日期 - 位于日期范围“Datevalidfrom”和'Datevalidto' 2. 如果 'yes' 则将“Unit”列更新为值“0”，否则保留相同的值。

预期输出：

Store       Product     Weekbegindate   Weekenddate     Datevalidfrom   Datevalidto     IP      Unit
11          AA          2021-02-24      2021-03-02      null            null            null    7.7
11          BB          2021-02-10      2021-02-16      2021-04-17      2021-12-01      44      59.9
11          CC          2021-06-09      2021-06-15      2021-06-03      2021-06-24      03      0

尝试查询：

SELECT t1.*,
      CASE WHEN (tt1.Store AND tt1.Product AND tt1.Weekbegindate AND tt1.Weekenddate) IS NOT NULL
      THEN 0 ELSE t1.Unit END as ip_Unit
FROM table1 t1
LEFT JOIN
    (SELECT * FROM table1 
      where IP is not null 
        and Datevalidfrom between Weekbegindate and Weekenddate
        or Datevalidto between Weekbegindate and Weekenddate
        or Weekbegindate between Datevalidfrom and Datevalidto
        or Weekenddate between Datevalidfrom and Datevalidto) tt1 
ON t1.Store = tt1.Store AND t1.Product = tt1.Product AND t1.Weekbegindate = tt1.Weekbegindate AND t1.Weekenddate = tt1.Weekenddate

但这行不通。任何帮助将不胜感激。提前致谢！

Answer 1

这听起来像 case 表达式：

select t1.* (except unit),
       (case when ip is not null and
                  Weekbegindate >= Datevalidfrom and
                  Weekenddate <= Datevalidto
             then 0 else unit
        end) as unit
from t1;

这个逻辑也可以合并到update。

在 BigQuery SQL 中：检查和更新 table 列值以满足日期约束

In BigQuery SQL: To check and update table column value on satisfying the date constraints

sql

date

left-join

google-bigquery