Question

我有一个列Description，其中包含字符串值。我想在某些特殊字符上拆分为2列，以生成以下2列：

1：测试/优雅条件

2：TASK100：优雅物品

以下样本数据的预期输出应该是column1和column2

Column1                             
----------------                                                
Individual/ Team Actions               
Individual/ Team Actions              
Task/ Environmental Conditions         
Task/ Environmental Conditions         
Task/ Environmental Conditions

Column2
---------
NULL

NULL

TW08: Equipment Integrity

TW01: Task Planning/ Preparation/ Manning

TW03: Work Procedures - Availability and Suitability

示例数据：

CREATE TABLE [Test]
(
    [Description] [varchar](250) NULL
)
insert into [Test] values
    ('Individual/ Team Actions\|2018.04.11 00:01:37\|N');
insert into [Test] values
    ('Individual/ Team Actions\|2018.04.11 00:01:37\|N');
insert into [Test] values
    ('Task/ Environmental Conditions : TW08: Equipment Integrity\|2018.04.11 00:01:37\|N');
insert into [Test] values
    ('Task/ Environmental Conditions : TW01: Task Planning/ Preparation/ Manning\|2018.04.11 00:01:37\|N');
insert into [Test] values
    ('Task/ Environmental Conditions : TW03: Work Procedures - Availability and Suitability\|2018.04.11 00:01:37\|N');

我使用了以下示例查询：

declare @a varchar(300)
select @a = 'Individual/ Team Actions\|2018.04.11 00:01:37\|N'
select @a C1,
    ltrim(rtrim(left(@a, charindex(':', @a)-1))) C2,
    ltrim(rtrim(substring(@a,
                          charindex(':', @a)+1,
                          charindex('\', @a)-(charindex(':', @a)+1) ))) C3

但出现以下错误：

Invalid length parameter passed to the LEFT or SUBSTRING function.

Answer 1

试试：

SELECT
case when charindex(' : ', description) = 0 then SUBSTRING(Description, 0, CHARINDEX('\|', Description)) else SUBSTRING(SUBSTRING(Description, 0, CHARINDEX('\|', Description)), 0, charindex(' : ', description)) end,
CASE WHEN CHARINDEX(' : ', Description) = 0 THEN NULL ELSE SUBSTRING(Description, CHARINDEX(' : ', Description) + 3,  CHARINDEX('\|', Description) - CHARINDEX(' : ', Description) - 3) END
FROM Test

返回：

Individual/ Team Actions       | NULL
Individual/ Team Actions       | NULL
Task/ Environmental Conditions | TW08: Equipment Integrity
Task/ Environmental Conditions | TW01: Task Planning/ Preparation/ Manning
Task/ Environmental Conditions | TW03: Work Procedures - Availability and Suitability

如何在SQL Server中使用一些特殊字符拆分字符串值？

1 个答案: