The column that does not match when comparing two records

Hi all

We try to compare two tables and find the differences. So if two records (1 of each table) have same PK but not always matching because of some columns, then we would display this columnname. For example:

Table 1

PK Parent Child Property1 Property2
1AA1P1PR1
2BB1P2oraPR2
3CC1P3SRP

Table 2

PK Parent Child Property1 Property2
1AA1P1PR1
2BB1P2PR2
3CC1P3PR4

In the above example when I compare 2 tables all matches except Property2 online n ° 3. Thus, we would like to get an output like:

PK Column_Mismatch
3Property2 (this must be the name of the column that does not match)

Appreciate the help.

Thank you

Andy

Hi, Andy.

Andy1484 wrote:

Hi all

We try to compare two tables and find the differences. So if two records (1 of each table) have same PK but not always matching because of some columns, then we would display this columnname. For example:

Table 1

PK Parent Child Property1 Property2
1 A A1 P1 PR1
2 B B1 P2 oraPR2
3 C C1 P3 PR3

Table 2

PK Parent Child Property1 Property2
1 A A1 P1 PR1
2 B B1 P2 PR2
3 C C1 P3 PR4

In the above example when I compare 2 tables all matches except Property2 online n ° 3. Thus, we would like to get an output like:

PK Column_Mismatch
3 Property2 (this must be the name of the column that does not match)

Appreciate the help.

Thank you

Andy

Why you don't want no matter what exit for pk = 2?  Property2 does not correspond either to pk.

What happens if the 2 columns (or more) do not match?  The following query would produce a list delimited, such as ' parents; PROPERTY2 '.

WITH got_mismatch AS

(

SELECT pk

, CASE WHEN t1.parent <> t2.parent THEN '; PARENT' END

|| CASE WHEN t1.child <> t2.child THEN '; CHILD ' END

|| CASE WHEN t1.properry1 <> t2.property1 THEN '; PROPERTY1 ' END

|| CASE WHEN t1.properry2 <> t2.property2 THEN '; PROPERTY2 ' END

AS the offset

FROM table_1 t1

JOIN table_2 t2 ON t2.pk = t1.pk

)

SELECT pk

, SUBSTR (incompatibility, 3) AS column_mismatch

OF got_mismatch

WHERE mismatch IS NOT NULL

;

If you would care to post CREATE TABLE and INSERT statements for your sample data, and then I could test this.

The query above does not count NULL values as inadequate.  If you want that, the same basic approach will work, but you can use DECODE instead of <> to compare columns.

What happens if a pk exist in a table, but not the other?  You want an outer join, where I used an inner join above.

Tags: Database

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