Help needed in Count Logic

Question

Hi Following are my table structure and data . i have two column( No.of.Fields , Text)
No.of.Fields | Text
8 | YYYYYYYY
6 | YYYYYY
4 | NNNN
3 | NNN
2 | YYYYY
i want a sample query to validate the no.field count and Text char count matches. if that doesn't match i want to get the particular record details.
In the above sameple no.of field 2 has exceeds char count. actual text shoulod be "YY".
so please help me to identify the rows which has non matached. i have more than 500 records in the table. please help me on this by providing the sample.

Answer 1

Hi.
>
Don't forget about NULLs:
>
Thanks you're right, it depends on how he want to deal with nulls, e.g. if we assume that nulls have a length of 0
Here's one way:
WITH data AS
     SELECT 8 n,'YYYYYYYY' string FROM DUAL UNION ALL
     SELECT 6 n,'YYYYYY' string FROM DUAL UNION ALL
     SELECT 4 n,'NNNN' string FROM DUAL UNION ALL
     SELECT 3 n,'NNN' string FROM DUAL UNION ALL
     SELECT 2 n,'YYYYY' string FROM DUAL UNION ALL
     SELECT 8 n,'YYYYYYY' string FROM DUAL UNION ALL
     SELECT 6 n,'YYYYY' string FROM DUAL UNION ALL
     SELECT 4 n,'NNN' string FROM DUAL UNION ALL
     SELECT 3 n,'NN' string FROM DUAL UNION ALL
     SELECT 2 n,'YYYY' string FROM DUAL UNION ALL
     SELECT 0 n,null string FROM DUAL UNION ALL
     SELECT 1 n,null string FROM DUAL
SELECT
     n,
     string,
     NVL(LENGTH(string),0) ls
FROM data
WHERE n != NVL(LENGTH(string),0);
N     STRING     LS
2     YYYYY     5
8     YYYYYYY     7
6     YYYYY     5
4     NNN     3
3     NN     2
2     YYYY     4
1     (null)     0Best regards.