基于另一个表中的列值的更新表

Question

我有以下表格。

表1

Id | Data | Values 
1 | rfsd | 23 
2 | fghf | 45 
3 | rhhh | 23 

表3

Id | Data | Values 
1 | rfsd | 23 
2 | tfgy | 23 

表2

Id | Fields | Counts 
1 | 23  | 0 
2 | 45  | 0 

正如你可以看到，计数字段的值为0我想看 '字段' 列在表2中，然后与表1和表3中的'值'列进行比较，并在'值'字段中存在该值时增加计数。

最终的结果应该显示像这样

Table 2 
Id | Fields | Counts 
1 | 23  | 4 
2 | 45  | 1 

这将是数自23出现四次，45在“价值”表1和表的字段出现一次3.

灿有人请让我知道如何为此编写存储过程。

我已经实现了这样的东西。

WITH t1 AS (
       SELECT VALUES, COUNT(*) AS Count2 FROM Table1 GROUP BY VALUES) 
UPDATE t2 
SET t2.Counts = t1.Count2 
FROM Table2 t2 
JOIN t1 ON t2.Fields=t1.Values; 

WITH t3 AS (SELECT VALUES, COUNT(*) AS Count3 FROM Table3 GROUP BY VALUES) 
UPDATE t2 
SET t2.Counts = t3.Count2 
FROM 
Table2 t2 
JOIN t3 ON t2.Fields=t3.Values; 

当我使用这个存储过程时，它将基于t1表更新t2，然后使用t3表覆盖表t2。

我希望t1和t3列在t2表上同时更新。任何想法如何纠正这个存储过程。

Answer 1

您可以使用UNION ALL到组两个表1和3一起（UNION ALL如果你想不交，UNION如果你想删除重复的）

WITH t13 AS (
    SELECT Id, Data, [Values] 
    FROM Table1 
    UNION ALL 
    SELECT Id, Data, [Values] 
    FROM Table3 
), cte AS (
    SELECT 
     [Values], 
     COUNT(*) AS Count2 
    FROM t13 
    GROUP BY 
     [Values] 
) 
UPDATE t2 
SET Counts = cte.Count2 
FROM 
    Table2 t2 JOIN cte ON t2.Fields = cte.[Values]; 

Answer 2

希望这会有所帮助。

SELECT t2.Id, t2.Fields, COUNT(1) Counts 
FROM Table2 t2 
    LEFT JOIN Table1 t1 ON t2.Fields = t1.[Values] 
    LEFT JOIN Table3 t3 ON t2.Fields = t3.[Values] 
GROUP BY t2.Id, t2.Fields 

如果您需要更新表2，使用以下命令： -

WITH Results AS (
    SELECT t2.Id, COUNT(1) Counts 
    FROM Table2 t2 
     LEFT JOIN Table1 t1 ON t2.Fields = t1.[Values] 
     LEFT JOIN Table3 t3 ON t2.Fields = t3.[Values] 
    GROUP BY t2.Id 
) 
UPDATE t 
SET Counts = r.Counts 
FROM Table2 t 
    JOIN Results r ON t.Id = r.Id;