SQL存储过程中的AZ循环

Question

For a project, I have to loop through the alphabet and run a search for each letter against some values in a database. The function would return the number of matches for each letter.

I would like to be able to do this in a SQL Stored Procedure, but I'm not certain how I could do a 'FOR letter = A to Z' loop in a SP. Does anyone know how this could be done?

Answer 1

it depends according to alphabet if you only need English characters you can do a loop from 65 (ascii for A) and 90 (Z) and use char letter = (char)i to get the letter.

If you also need non-English ones just set a web config setting "ABC......Z" and loop through it.

Answer 2

with ATable(c) as
(
  select cast('A' as CHAR(1)) as c
  union all
  select CHAR(ASCII(c)+1) as C from ATable where C<'Z'

)
select * from ATable

SQLFiddle demo

Answer 3

Use a loop going from 65 (A) to 90 (Z), and use the T-SQL CHAR() function .

Of course, I'm assuming that you are using a SQL Server database. If not, please post the DB you're using.

Answer 4

You need to use "group by" and possibly include "count" in the query too. you can find further information here http://msdn.microsoft.com/en-us/library/ms177673.aspx

Answer 5

;WITH Alphabet AS 
(
    SELECT CHAR(65) AS Letter, 65 AS Code
    UNION ALL
    SELECT CHAR(Code + 1),  Code + 1
    FROM Alphabet
    WHERE Code < 90
) 

SELECT Letter 
FROM Alphabet

Answer 6

WITH alpha AS
(
    SELECT 65 AS c
    UNION ALL
    SELECT c + 1 FROM alpha
    WHERE c < 90
)
SELECT CHAR(c) FROM alpha