在where子句中使用sql與

Question

如何在這樣的查詢中使用？有沒有辦法在TableList中使用tableIds？我可以把它們當作子查詢嗎？

select * from TestTable where tableId in 

(WITH TableList (tableId) 
AS 
(
SELECT tableId FROM OldTable WHERE tableId=5 and IsDeleted = 0 
UNION ALL 
SELECT t.tableId From OldTable as t 
INNER JOIN TableList as p 
ON t.ParenTableId = p.TableId 
WHERE t.IsDeleted = 0 
) 
SELECT tableId FROM TableList 
) 

編輯：爲了說明爲什麼我不能在sql的第一條語句中使用。

select TableId, IsDeleted, 
( 
    select count(OtherId) OtherTable 
    where otherTableId in 
    (WITH TableList (tableId) 
    AS 
    (
    SELECT tableId FROM OldTable WHERE tableId=5 and IsDeleted = 0 
    UNION ALL 
    SELECT t.tableId From OldTable as t 
    INNER JOIN TableList as p 
    ON t.ParenTableId = p.TableId 
    WHERE t.IsDeleted = 0 
) 
    SELECT tableId FROM TableList 
) 
) as Ex1 
from TestTable where tableId in (1,2,3) 

我覺得這個節目爲什麼我嘗試在SQL查詢的中間有子句中使用。

Answer 1

您需要調用SQL之前定義與CTE您：

WITH TableList (tableId) 
AS 
(
    SELECT tableId FROM OldTable WHERE tableId=5 and IsDeleted = 0 
    UNION ALL 
    SELECT t.tableId From OldTable as t 
     INNER JOIN TableList as p 
      ON t.ParenTableId = p.TableId 
    WHERE t.IsDeleted = 0 
) 
SELECT * 
FROM TestTable 
WHERE tableId in 
(
    SELECT tableId FROM TableList 
) 

編輯 - 根據您的意見，您可以在VIEW中定義遞歸CTE，然後根據需要使用：

CREATE VIEW YourView AS 
WITH TableList (tableId) 
AS 
(
    SELECT tableId FROM OldTable WHERE tableId=5 and IsDeleted = 0 
    UNION ALL 
    SELECT t.tableId From OldTable as t 
     INNER JOIN TableList as p 
      ON t.ParenTableId = p.TableId 
    WHERE t.IsDeleted = 0 
) 
SELECT * 
FROM TableList; 

Answer 2

我更喜歡在JOIN這樣做，所以它看起來像這樣。 WITH語句始終是sql查詢語句中的第一個語句。

甲DISTINCT關鍵字上SELECT子句施加，以使結果是獨特如果曾經有從TestTable具有在公共表表達式多個匹配的記錄。

WITH TableList (tableId) 
AS 
(
    SELECT tableId FROM OldTable WHERE tableId=5 and IsDeleted = 0 
    UNION ALL 
    SELECT t.tableId From OldTable as t 
    INNER JOIN TableList as p 
    ON t.ParenTableId = p.TableId 
    WHERE t.IsDeleted = 0 
) 
SELECT DISTINCT a.* 
FROM TestTable a 
     INNER JOIN TableList b 
      ON a.tableId = b.tableId 

---

更新1

WITH TableList (tableId) 
AS 
(
    SELECT tableId FROM OldTable WHERE tableId=5 and IsDeleted = 0 
    UNION ALL 
    SELECT t.tableId From OldTable as t 
    INNER JOIN TableList as p 
    ON t.ParenTableId = p.TableId 
    WHERE t.IsDeleted = 0 
) 
SELECT DISTINCT t.TableId, t.IsDeleted, f.totalCount 
FROM TestTable t 
     INNER JOIN 
     (
      SELECT a.otherTableId, COUNT(DISTINCT a.OtherId) totalCount 
      FROM OtherTable a 
        INNER JOIN TableList b 
         ON b.tableId = a.otherTableId 
      GROUP BY otherTableId 
     ) f ON t.tableId = f.otherTableId 
WHERE t.tableId in (1,2,3)