带子字符串charindex的sql查询

时间：2017-06-14 15:42:37

标签： sql sql-server substring charindex 

table1
::::::::::::::::::::::::::::::::::
id | id_data | id_t | value 
1  | 43      | 1    | 
2  | 46      | 1    | 111,112,113
3  | 43      | 2    | 
4  | 46      | 2    | 90,5

table2
:::::::::::::::::::::::::::::::::::
id_value | cat
112      | cat1
5        | cat2

嗨，如果可能的话，我需要一些帮助。

我需要使用table2.cat更新table1.value，其中id_data为43，其中id_value =值＆＃39; s＆＃39;，＆＃39;之后的数字直到下一个＆＃39;，＆＃39;如果＆＃39; id_t＆＃39;中的每个群组都有。

我尝试了一个简单的查询，但它返回了一些空值，但值为＆＃39;不能为空

update table1 
set value = (select cat from table2 
            where convert(nvarchar,id_value) = substring(value,5,3))
where id_data='43'

我一直试图将CHARINDEX纳入＆＃39;，＆＃39;但我无法弄清楚它是如何工作的。

理想情况下，它应如下所示：

::::::::::::::::::::::::::::::::::
id | id_data | id_t | value 
1  | 43      | 1    | cat1
2  | 46      | 1    | 111,112,113
3  | 43      | 2    | cat2
4  | 46      | 2    | 90,5

有人能指出我正确的方向吗？

我觉得这很简单..但我还在学习......

提前谢谢。

::::::::::::::::

UPDATE1 

WITH UpdateableCTE AS
(
    SELECT t1.id
          ,t1.id_data
          ,t1.id_t
          ,SecondNr
          ,(
            SELECT t2.cat
            FROM @table2 AS t2 WHERE t2.id_value=SecondNr
           ) AS NewCat
           ,t1.value
    FROM @table1 AS t1
    OUTER APPLY(SELECT CAST('<x>' + REPLACE(x.value,',','</x><x>') + '</x>' AS XML).value('/x[2]','int')
                FROM @table1 AS x 
                WHERE x.id_t=t1.id_t AND x.value IS NOT NULL AND id_data='46') AS ID(SecondNr)
    WHERE t1.value IS NULL
)
UPDATE UpdateableCTE SET value=NewCat;
--somehow where id_data='43'

我将在这里留下一张表，其中包含所有id_data和字段的真实表：

17974492    1   999251  somevalue
17974493    2   999251  somevalue
17974494    3   999251  somevalue
17974495    4   999251  somevalue
17974496    5   999251  somevalue
17974497    43  999251  (thishsouldbeupdated)
17974498    6   999251  somevalue
17974499    7   999251  somevalue
17974500    46  999251  111,311
17974501    8   999251  somevalue
17974502    9   999251  somevalue
17974503    10  999251  somevalue
17974504    11  999251  somevalue
17974505    12  999251  somevalue
17974506    13  999251  somevalue
17974507    1   999252  somevalue
17974508    2   999252  somevalue
17974509    3   999252  somevalue
17974510    4   999252  somevalue
17974511    5   999252  somevalue
17974512    43  999252  (thisshouldbeupdated)
17974513    6   999252  somevalue
17974514    7   999252  somevalue
17974515    46  999252  98,98
17974516    8   999252  somevalue
17974517    9   999252  somevalue
17974518    10  999252  somevalue
17974519    11  999252  somevalue
17974520    12  999252  somevalue
17974521    13  999252  somevalue

1 个答案:

答案 0 :(得分：0)

这不干净，也不是我推荐的东西，但你可能会找到一些帮助：

DECLARE @table1 TABLE(id INT,id_data INT,id_t INT,value VARCHAR(100));
INSERT INTO @table1 VALUES 
 (1,43,1,NULL)
,(2,46,1,'111,112,113')
,(3,43,2,NULL)
,(4,46,2,'90,5')

DECLARE @table2 TABLE(id_value INT,cat VARCHAR(100));
INSERT INTO @table2 VALUES
 (112,'cat1')
,(5,'cat2');

SELECT t1.id
      ,t1.id_data
      ,t1.id_t
      ,ID.List
      ,(
        SELECT t2.cat
        FROM @table2 AS t2 WHERE CHARINDEX(',' + CAST(t2.id_value AS VARCHAR(100)) + ',',',' + ID.List + ',')>0
       )
FROM @table1 AS t1
OUTER APPLY(SELECT x.value FROM @table1 AS x WHERE x.id_t=t1.id_t AND x.value IS NOT NULL) AS ID(List)
WHERE t1.value IS NULL

更新：您对的说明使用第二个号码作为更新

试试这个

DECLARE @table1 TABLE(id INT,id_data INT,id_t INT,value VARCHAR(100));
INSERT INTO @table1 VALUES 
 (1,43,1,NULL)
,(2,46,1,'111,112,113')
,(3,43,2,NULL)
,(4,46,2,'90,5')

DECLARE @table2 TABLE(id_value INT,cat VARCHAR(100));
INSERT INTO @table2 VALUES
 (112,'cat1')
,(5,'cat2');

WITH UpdateableCTE AS
(
    SELECT t1.id
          ,t1.id_data
          ,t1.id_t
          ,SecondNr
          ,(
            SELECT t2.cat
            FROM @table2 AS t2 WHERE t2.id_value=SecondNr
           ) AS NewCat
           ,t1.value
    FROM @table1 AS t1
    OUTER APPLY(SELECT CAST('<x>' + REPLACE(x.value,',','</x><x>') + '</x>' AS XML).value('/x[2]','int')
                FROM @table1 AS x 
                WHERE x.id_t=t1.id_t AND x.value IS NOT NULL) AS ID(SecondNr)
    WHERE t1.value IS NULL
)
UPDATE UpdateableCTE SET value=NewCat;

SELECT * FROM @table1

概念是可更新的CTE ，您可以使用普通SELECT来获取所需的值。然后，您可以直接更新派生表（只要只有一个表的列受影响）。

OUTER APPLY使用XML的技巧拆分CSV列表以读取第二个数字。

更新2：使用新的样本数据

以下内容将使用新的示例数据并使用ID：

DECLARE @table1 TABLE(id INT,id_data INT,id_t INT,value VARCHAR(100));
INSERT INTO @table1 VALUES 
 (17974492,1,999251,'somevalue')
,(17974493,2,999251,'somevalue')
,(17974494,3,999251,'somevalue')
,(17974495,4,999251,'somevalue')
,(17974496,5,999251,'somevalue')
,(17974497,43,999251,'(thishsouldbeupdated)')
,(17974498,6,999251,'somevalue')
,(17974499,7,999251,'somevalue')
,(17974500,46,999251,'111,311')
,(17974501,8,999251,'somevalue')
,(17974502,9,999251,'somevalue')
,(17974503,10,999251,'somevalue')
,(17974504,11,999251,'somevalue')
,(17974505,12,999251,'somevalue')
,(17974506,13,999251,'somevalue')
,(17974507,1,999252,'somevalue')
,(17974508,2,999252,'somevalue')
,(17974509,3,999252,'somevalue')
,(17974510,4,999252,'somevalue')
,(17974511,5,999252,'somevalue')
,(17974512,43,999252,'(thisshouldbeupdated)')
,(17974513,6,999252,'somevalue')
,(17974514,7,999252,'somevalue')
,(17974515,46,999252,'98,98')
,(17974516,8,999252,'somevalue')
,(17974517,9,999252,'somevalue')
,(17974518,10,999252,'somevalue')
,(17974519,11,999252,'somevalue')
,(17974520,12,999252,'somevalue')
,(17974521,13,999252,'somevalue');

DECLARE @table2 TABLE(id_value INT,cat VARCHAR(100));
INSERT INTO @table2 VALUES
 (311,'cat1')
,(98,'cat2');

WITH UpdateableCTE AS
(
    SELECT t1.id
          ,t1.id_data
          ,t1.id_t
          ,SecondNr
          ,(
            SELECT t2.cat
            FROM @table2 AS t2 WHERE t2.id_value=SecondNr
           ) AS NewCat
           ,t1.value
    FROM @table1 AS t1
    OUTER APPLY(SELECT CAST('<x>' + REPLACE(x.value,',','</x><x>') + '</x>' AS XML).value('/x[2]','int')
                FROM @table1 AS x 
                WHERE x.id_t=t1.id_t AND x.id_data=46) AS ID(SecondNr)
    WHERE t1.id_data=43
)
UPDATE UpdateableCTE SET value=NewCat;

SELECT * FROM @table1;
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