sql,sql-server,sql-server-2008 , SQL Customized search with special characters
SQL Customized search with special characters
I am creating a key-wording module where I want to search data using the comma separated words.And the search is categorized into comma
, and minus
-. I know a relational database engine is designed from the principle that a cell holds a single value and obeying to this rule can help for performance.But in this case table is already running and have millions of data and can't change the table structure.
Take a look on the example what I exactly want to do is
I have a main table name
tbl_main in SQL
1 Man,Businessman,Business,Office,confidence,arms crossed
3 man,business,mobile phone,mobile,phone
5 beautiful,bride,wedding,woman,girl,happiness,mobile phone,talking
6 woman,girl,Digital Tablet,working,sitting,online
7 woman,girl,Digital Tablet,working,smiling,happiness,hand on chin
If search text is = Man,Businessman then result AS_ID is =1,2
If search text is = Man,-Businessman then result AS_ID is =3
If search text is = woman,girl,-Working then result AS_ID is =4,5
If search text is = woman,girl then result AS_ID is =4,5,6,7
What is the best why to do this, Help is much appreciated.Thanks in advance
Here is my attempt using Jeff Moden's DelimitedSplit8k to split the comma-separated values.
First, here is the splitter function (check the article for updates of the script):
CREATE FUNCTION [dbo].[DelimitedSplit8K](
@pString VARCHAR(8000), @pDelimiter CHAR(1)
RETURNS TABLE WITH SCHEMABINDING AS
WITH E1(N) AS (
SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL
SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
,E2(N) AS (SELECT 1 FROM E1 a, E1 b)
,E4(N) AS (SELECT 1 FROM E2 a, E2 b)
SELECT TOP (ISNULL(DATALENGTH(@pString), 0)) ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E4
SELECT 1 UNION ALL
SELECT t.N+1 FROM cteTally t WHERE SUBSTRING(@pString, t.N, 1) = @pDelimiter
cteLen(N1, L1) AS(
ISNULL(NULLIF(CHARINDEX(@pDelimiter, @pString, s.N1),0) - s.N1, 8000)
FROM cteStart s
ItemNumber = ROW_NUMBER() OVER(ORDER BY l.N1),
Item = SUBSTRING(@pString, l.N1, l.L1)
FROM cteLen l
Here is the complete solution:
-- search parameter
DECLARE @search_text VARCHAR(8000) = 'woman,girl,-working'
-- split comma-separated search parameters
-- items starting in '-' will have a value of 1 for exclude
DECLARE @search_values TABLE(ItemNumber INT, Item VARCHAR(8000), Exclude BIT)
INSERT INTO @search_values
CASE WHEN LTRIM(RTRIM(Item)) LIKE '-%' THEN LTRIM(RTRIM(STUFF(Item, 1, 1 ,''))) ELSE LTRIM(RTRIM(Item)) END,
CASE WHEN LTRIM(RTRIM(Item)) LIKE '-%' THEN 1 ELSE 0 END
FROM dbo.DelimitedSplit8K(@search_text, ',') s
;WITH CteSplitted AS( -- split each KWD to separate rows
FROM tbl_main t
ItemNumber, Item = LTRIM(RTRIM(Item))
FROM dbo.DelimitedSplit8K(t.KWD, ',')
FROM CteSplitted cs
INNER JOIN @search_values sv
ON sv.Item = cs.Item
GROUP BY cs.AS_ID
-- all parameters should be included (Relational Division with no Remainder)
COUNT(DISTINCT cs.Item) = (SELECT COUNT(DISTINCT Item) FROM @search_values WHERE Exclude = 0)
-- no exclude parameters
AND SUM(CASE WHEN sv.Exclude = 1 THEN 1 ELSE 0 END) = 0
This one uses a solution from the Relational Division with no Remainder problem discussed in this article by Dwain Camps.
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