我在 T-SQL 中有这个语句。
SELECT Bay From TABLE where uid in (
select B_Numbers from Info_Step WHERE uid = 'number'
)
我BAY从TABLE它们uid等于一串数字的地方选择“多个”，如下所示：
B_Numbers = 1:45:34:98
因此，我应该从中选择 4 个不同BAY的 s TABLE。我基本上需要将字符串1:45:34:98分成 4 个不同的数字。
我认为 Split() 会起作用，但它不起作用，我得到一个语法错误。来自 T-SQL 之神的任何想法都会很棒！
这是一种使用辅助数字表来解析输入字符串的方法。可以轻松地将逻辑添加到返回表的函数中。然后可以连接该表以查找正确的行。
第 1 步：创建 Numbers 表
SET NOCOUNT ON
GO
IF EXISTS
(
SELECT 1
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME = 'Numbers'
AND TABLE_SCHEMA = 'dbo'
AND TABLE_TYPE = 'BASE TABLE'
)
BEGIN
DROP TABLE dbo.Numbers
END
GO
CREATE TABLE dbo.Numbers
(
Number smallint IDENTITY(1, 1) PRIMARY KEY
)
GO
WHILE 1 = 1
BEGIN
INSERT INTO dbo.Numbers DEFAULT VALUES
IF SCOPE_IDENTITY() = 32767
BEGIN
BREAK
END
END
GO
第 2 步：解析输入字符串
CREATE FUNCTION dbo.ParseString(@input_string varchar(8000), @delim varchar(8000) = " ")
RETURNS TABLE
AS RETURN
(
SELECT Number
FROM dbo.Numbers
WHERE CHARINDEX
(
@delim + CONVERT(VARCHAR(12),Number) + @delim,
@delim + @input_string + @delim
) > 0
)
GO
**EXAMPLE**
SELECT * FROM dbo.ParseString('1:45:34:98',':')
第 3 步：使用您想要/需要的结果
Number
------
1
34
45
98
端到端示例
创建返回适当 BNumber 的函数（当然将其更改为使用注释掉的 SQL）
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE FUNCTION dbo.GetBNumber (@uid int)
RETURNS VARCHAR(8000)
AS
BEGIN
RETURN '1:45:34:98'
--select B_Numbers from Info_Step WHERE uid = @uid
END
GO
使用使用函数返回所需的结果
-- Using Test Data
SELECT N.Number FROM Numbers N
JOIN dbo.ParseString(dbo.GetBNumber(12345),':') Q ON Q.Number = N.Number
-- Using Your Data (Untested but should work.)
SELECT N.Bay
FROM TABLE N
JOIN dbo.ParseString(dbo.GetBNumber(ENTER YOU NUMBER HERE),':') Q ON Q.Number = N.uid
结果
Number
------
1
34
45
98
您应该将数组保留为行，但如果我理解您的问题，我认为这会起作用。
SELECT
Bay
From
TABLE
join Info_Step
on B_Numbers like '%'+ uid +'%'
where
Info_Step.uid = 'number'
由于 like 运算符，此查询将执行全表扫描。
您可以做的是遍历条目并在将这些条目插入临时表时进行B_Numbers自己的拆分，然后执行查询。:
DECLARE @i int
DECLARE @start int
DECLARE @B_Numbers nvarchar(20)
DECLARE @temp table (
number nvarchar(10)
)
-- SELECT B_Numbers FROM Info_Step WHERE uid = 'number'
SELECT @B_Numbers = '1:45:34:98'
SET @i = 0
SET @start = 0
-- Parse out characters delimited by ":";
-- Would make a nice user defined function.
WHILE @i < len(@B_Numbers)
BEGIN
IF substring(@B_Numbers, @i, 1) = ':'
BEGIN
INSERT INTO @temp
VALUES (substring(@B_Numbers, @start, @i - @start))
SET @start = @i + 1
END
SET @i = @i + 1
END
-- Insert last item
INSERT INTO @temp
VALUES (substring(@B_Numbers, @start, @i - @start + 1))
-- Do query with parsed values
SELECT Bay FROM TABLE WHERE uid in (SELECT * FROM @temp)
你甚至可以试试这个
declare @str varchar(50)
set @str = '1:45:34:98'
;with numcte as(
select 1 as rn union all select rn+1 from numcte where rn<LEN(@str)),
getchars as(select
ROW_NUMBER() over(order by rn) slno,
rn,chars from numcte
cross apply(select SUBSTRING(@str,rn,1) chars)X where chars = ':')
select top 1
Bay1 = SUBSTRING(@str,0,(select rn from getchars where slno = 1))
,Bay2 = SUBSTRING(@str,
(select rn from getchars where slno = 1) + 1,
(((select rn from getchars where slno = 2)-
(select rn from getchars where slno = 1)
)-1))
,Bay3 = SUBSTRING(@str,
(select rn from getchars where slno = 2) + 1,
(((select rn from getchars where slno = 3)-
(select rn from getchars where slno = 2)
)-1))
,Bay4 = SUBSTRING(@str,
(select rn from getchars where slno = 3)+1,
LEN(@str))
from getchars
输出：
Bay1 Bay2 Bay3 Bay4
1 45 34 98