SQL Server 2014：逗号后加空格

Question

I want to update only the values in Column1 that have characters of a string, then a comma, then (without a space) more characters, like so: abc,def or abc,123,def . I want a space to be added between the comma and the next character, like so: abc, def or abc, 123, def . It shouldn't add an extra space if there already is one.

Sorry, I don't have any existing SQL to show-- I'm not sure where to even start on this.

Answer 1

I'd first replace all instances of , (comma + space) with , (comma, NO space). That way everything is uniform. Then go the other way; replace commas with comma + space

Answer 2

Perhaps a little overkill, but this will support any combination of space(s) before and after a comma

Example

Declare @S varchar(max) = 'abc  ,     123 , def,    ddd'

Select replace(replace(replace(replace(@S,',','<>'),' ','<>'),'><',''),'<>',', ')

Returns

abc, 123, def, ddd

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I should add , this is a little trick from Gordon several months ago. I don't have the original link

Answer 3

I think you are need to first remove space and then add space to column1 near

 UPDATE yt set yt.Column1 =replace(replace(yt.Column1 ,' ',''),',',', ')
  from yourtable yt
  where yt.Column1 like '%,%'

Answer 4

This would do what you are wanting

UPDATE TABLE
SET Col1 = REPLACE(REPLACE(Col1,', ',','),',',', ')
WHERE Col1 LIKE '%,%'

Answer 5

If one needs exactly one space after the comma and the data is not consistent there is also the option of a string_split and then string_agg:

DECLARE @test varchar(max) = 'Test, Test 12,Test34,Test56 ,     Test78'
select STRING_AGG(Trim(value),', ') as Test from string_split(@test,',')

Result:

Test, Test 12, Test34, Test56, Test78

If possible you should use the new "enable_ordinal" option of string_split, but i actually never had problems with the order.