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query logic question... Expand / Collapse
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Posted Sunday, November 17, 2013 5:52 PM


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roy.tollison (11/16/2013)
i guess i could put the results into a table then use a cursor and process all the rows and use the value in the cf_field(real column name is stored in there) and then build an update command to load up the int value that is assigned to that column for that row.
will be a while before i get all the basics in place and all the bugs worked out...


Heh... yeah. Let us know how the cursor thing works you for you.

Since folks still have questions about what you're actually trying to do, I recommend that you try to clarify the problem using the suggestions from the 1st link under "Helpful Links" in my signature line below. Obviously, you don't have to post the whole table or a million rows of data but there's nothing like cold hard data in a table to clarify a problem.


--Jeff Moden
"RBAR is pronounced "ree-bar" and is a "Modenism" for "Row-By-Agonizing-Row".

First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."

(play on words) "Just because you CAN do something in T-SQL, doesn't mean you SHOULDN'T." --22 Aug 2013

Helpful Links:
How to post code problems
How to post performance problems
Post #1515044
Posted Sunday, November 17, 2013 6:02 PM
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CREATE TABLE [dbo].[nTable](
[p_key] [int] NOT NULL,
[mf_1] [char](5) NULL,
[mf_2] [char](5) NULL,
[mf_3] [char](5) NULL,
[mf_4] [char](5) NULL,
[mf_5] [char](5) NULL,
[cf_1] [int] NULL,
[cf_2] [int] NULL,
[cf_3] [int] NULL,
[cf_4] [int] NULL,
[cf_5] [int] NULL,
CONSTRAINT [PK_nTable] PRIMARY KEY CLUSTERED
(
[p_key] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

Sample Data...
p_key mf_1 mf_2 mf_3 mf_4 mf_5 cf_1 cf_2 cf_3 cf_4 cf_5
1 AAA BBB CCC DDD EEE 5 5 5 5 5
2 BBB DDD BBB BBB BBB 5 5 5 5 5
3 EEE DDD CCC BBB AAA 5 5 5 5 5
4 FFF HHH III AAA NULL 4 4 4 4 NULL
5 ZZZ NULL NULL NULL NULL 1 NULL NULL NULL NULL
6 GGG BBB EEE AAA NULL 4 4 4 4 NULL
7 MMM EEE AAA NULL NULL 3 3 3 NULL NULL
8 NULL NULL NULL NULL NULL 0 0 0 0 0
9 RRR TTT DDD BBB CCC 5 5 5 5 5
10 BBB CCC AAA NULL NULL 3 3 3 NULL NULL
11 CCC AAA NULL BBB NULL 3 3 NULL 3 NULL
12 WWW UUU AAA CCC EEE 5 5 5 5 5
13 SSS AAA DDD EEE NULL 4 4 4 4 NULL
14 EEE FFF BBB AAA NULL 4 4 4 4 NULL
15 TTT NULL NULL NULL NULL 1 NULL NULL NULL NULL
16 YYY AAA NULL NULL NULL 2 2 NULL NULL NULL
17 GGG XXX BBB NULL NULL 3 3 3 NULL NULL
18 BBB AAA CCC EEE DDD 5 5 5 5 5
19 PPP BBB TTT JJJ NULL 4 4 4 4 NULL
20 KKK LLL NULL NULL NULL 2 2 NULL NULL NULL

drop table pvtTable

select p_key, mf_value, mf_field, REPLACE(mf_field,'mf_','cf_') as cf_field into pvtTable from nTable
unpivot
(mf_value for mf_field in
(mf_1, mf_2, mf_3, mf_4, mf_5)) as pvtTable where mf_value in ('AAA','BBB')

declare getCSField cursor for select p_key, cf_field from pvtTable
open getCSField
declare @cmd varchar(max),
@P_Key int,
@CSField as varchar(100);
fetch next from getCSField into @P_Key, @CSField
while @@FETCH_STATUS = 0
begin
begin try
execute ('select ' + @P_Key + ' as p_key, ' + @CSField + ' from nTable where p_key = ' + @P_Key)
end try
begin catch
select @P_Key, @CSField
end catch
fetch next from getCSField into @P_Key, @CSField;
end
CLOSE getCSField
DEALLOCATE getCSField

Post #1515046
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