tsql - Split/explode comma delimited string with Sybase SQL Anywhere

Question

UPDATE: Someone marked this question as duplicate of How do I split a string so I can access item x. But it's different, my question is about Sybase SQL Anywhere, the other is about MS SQL Server. These are two different SQL engines, even if they have the same origin, they have different syntax. So it's not duplicate. I wrote in the first place in description and tags that it's all about Sybase SQL Anywhere.

I have field id_list='1234,23,56,576,1231,567,122,87876,57553,1216'

and I want to use it to search IN this field:

SELECT * 
FROM table1
WHERE id IN (id_list)

• id is integer

• id_list is varchar/text

But in this way this doesn't work, so I need in some way to split id_list into select query.

What solution should I use here? I'm using the T-SQL Sybase ASA 9 database (SQL Anywhere).

Way I see this, is to create own function with while loop through, and each element extract based on split by delimiter position search, then insert elements into temp table which function will return as result.

Answer 1

This can be done without using dynamic SQL but you will need to create a couple of supporting objects. The fist object is a table valued function that will parse your string and return a table of integers. The second object is a stored procedure that will have a parameter where you can pass the string (id_list), parse it to a table, and then finally join it to your query.

First, create the function to parse the string:

CREATE FUNCTION [dbo].[String_To_Int_Table]
(
         @list NVARCHAR(1024)
       , @delimiter NCHAR(1) = ',' --Defaults to CSV
)
RETURNS
    @tableList TABLE(
       value INT
       )
AS

BEGIN
   DECLARE @value NVARCHAR(11)
   DECLARE @position INT

   SET @list = LTRIM(RTRIM(@list))+ ','
   SET @position = CHARINDEX(@delimiter, @list, 1)

   IF REPLACE(@list, @delimiter, '') <> ''
   BEGIN
          WHILE @position > 0
          BEGIN 
                 SET @value = LTRIM(RTRIM(LEFT(@list, @position - 1)));
                 INSERT INTO @tableList (value)
                 VALUES (cast(@value as int));
                 SET @list = RIGHT(@list, LEN(@list) - @position);
                 SET @position = CHARINDEX(@delimiter, @list, 1);

          END
   END   
   RETURN
END

Now create your stored procedure:

    CREATE PROCEDURE ParseListExample
    @id_list as nvarchar(1024)
    AS
    BEGIN

    SET NOCOUNT ON;

    --create a temp table to hold the list of ids
    CREATE TABLE #idTable (ID INT);

    -- use the table valued function to parse the ids into a table.
    INSERT INTO #idTable(ID)
    SELECT Value FROM   dbo.String_to_int_table(@id_list, ',');

    -- join the temp table of ids to the table you want to query...
    SELECT T1.* 
    FROM table1 T1
    JOIN #idTable T2
    on T1.ID = T2.ID

Execution Example:

 exec ParseListExample @id_list='1234,23,56,576,1231,567,122,87876,57553,1216'

I hope this helps...