SQL 删除字符

Question

I am using the below case statement

***, CASE WHEN Attributes LIKE ',Size = %,' Then  right(Attributes, len(Attributes) - charindex('Size  ', Attributes)) ELSE '' END as Size***

To get the below result

,Size = XXL,Fits to Chest Size = 48 to 50 in,,Closure Type = Snap Button,Material = Cotton,Color = Khaki,Sleeve Length = 33 in,Lining Material = Polyester Thread,,Fabric Weight = 9 oz,,,Resists = Flame,,,,,,,,,,,,,,,,,,,,,,,,,,

I want to remove everything and only have Size = XXL

Any help is appreciated.

Answer 1

If this is not an ETL process, then you should really consider changing your data model so you that you do not have to parse your Attribute column every time.

Below is a short solution with

• STRING_SPLIT() (SQL Server 2016 and later)
• TRIM() (SQL Server 2017 and later)

Sample data

create table CsvData
(
  Attribute nvarchar(1000)
);

insert into CsvData (Attribute) values
('Foo = 10,Bar = 20,,,,,Size = XXL ,Fits to Chest Size = 48 to 50 in,,Closure Type = Snap Button ,Material = Cotton ,Color = Khaki ,Sleeve Length = 33 in,Lining Material = Polyester Thread ,,Fabric Weight = 9 oz,,,Resists = Flame ,,,,,,,,,,,,,,,,,,,,,,,,,,');

Solution

select trim(s.value) as SizeAttribute
from CsvData cd
cross apply string_split(cd.Attribute, ',') s
where left(s.value, 4) = 'Size';

Result

SizeAttribute
-------------
Size = XXL

Fiddle to see it in action.

Answer 2

Try This:

DECLARE @CsvData TABLE(Attribute nvarchar(1000));

insert into @CsvData (Attribute) values
('Foo = 10,Bar = 20,,,,,Size = XXL ,Fits to Chest Size = 48 to 50 in,,Closure Type = 
Snap Button ,Material = Cotton ,Color = Khaki ,Sleeve Length = 33 in,Lining Material = 
Polyester Thread ,,Fabric Weight = 9 oz,,,Resists = Flame ,,,,,,,,,,,,,,,,,,,,,,,,,,');


DECLARE @xml_value AS XML,
    @string_value AS VARCHAR(2000),
    @delimiter_value AS VARCHAR(15)
SET @string_value=(SELECT Attribute FROM @CsvData)
SET @delimiter_value =','
SET @xml_value = Cast(( '<studentname>'+ Replace(@string_value, @delimiter_value, '</studentname><studentname>') + '</studentname>' ) AS XML)
SELECT   x.m.query('.').value('.', 'VARCHAR(15)') AS VALUE
FROM   @xml_value.nodes('/studentname') AS x(m)
WHERE  x.m.query('.').value('.', 'VARCHAR(15)')  LIKE 'Size%'