Comparing Data between two tables with different structure

Hi,
I have 2 tables T1 and T2. Both tables have different structure. I have to check for rows missing in T1 which exist in T2 and vice-versa. I can do that using MINUS operator. But the part where the data exists in both T1 and T2, I have to compare some columns (9 columns the names of this column coming from a meta-data table) if they have same values. If not an exception has to be generated.
Any help is appreciated.
Thanks

Hi,
Whenever you need help on this forum, post:
(1) The version of Oracle (and any other relevant software) you're using
(2) A little sample data (just enough to show what the problem is) from all the relevant tables
(3) The results you want from that data (4) Your best attempt so far
Executable SQL statements (like "CREATE TABLE AS ..." or "INSERT ..." statements) are best for (2).
Formatted tabular output is okay for (3). Type before and after the tabular text, to preserve spacing.
What do you mean by "an exception has to be generated"?
Do you want to raise an error?
Do you want something to appear in the result set?
MINUS finds rows that are in one result set, but not in another.
INTERSECT finds rows that are in both result sets.
Column names have to be hard-coded into the SQL statement. If you want to write something now that will get column names from a metadata table sometime in the future, then you have to use dynamic SQL. SQL*Plus sometimes has quick and dirty ways of doing dynamic SQL, so say whether you're using SQL*Plus or not.

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Compare data between two tables

Hey Experts
I am having two tables both are having same structure.
Both r having 210 columns
I want to compare data between these two tables.
I used follwoing query
select * from t1
MINUS
select * from t2but even if thr is diff in 1columns .. i need to search 210 columns which is the exact columns and data
how can i find the exact columns out of these 210 columns ?

SShubhangi wrote:
but even if thr is diff in 1columns .. i need to search 210 columns which is the exact columns and data
how can i find the exact columns out of these 210 columns ?This is not a trivial problem to solve. Consider a much simpler data set. In table 1 (four columns) we have
1 A B C
2 D E F
3 A B Dand in In table 2 (four columns) we have
2 X Y Z
3 A B ENow
select * from table1 minus select * from table2gives
1 A B C
2 D E F
3 A B Dwhereas
select * from table2 minus select * from table1gives
2 X Y Z
3 A B ENow clearly the first row in Table1 (ID=1) doesn't match any row in Table2 but it's only two columns out from the last row in Table2 (ID=3). However, the row in Table1 with ID=3 only doesn't match on one column.
So, how do you represent the output?
Clearly what you want can only be achieved if there are some columns which ought to be the same in both tables i.e. key columns. In which case you can use a full outer join link teh two tables, and case statements to display only the values which don't match:
select t1.id as t1_id
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        , case when t1.col1 != t2.col1 then r1.col1 end as t2_col1
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        , case when t1.col3 != t2.col3 then r1.col3 end as t1_col2
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Scenario
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TableA
Col1 Var(10)
Col2  INT
TableB
Col1 Var(10)
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TableA
ColA          ColB
INDIA          1
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TableB
ColA          ColB
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ColA          ColB
True            0
False           -1
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Amit
Please mark as answer if helpful
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Whereas the abbreviation of countries that exist in Table2 table are the first three letters of the name of the country*, here's a suggestion:
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INSERT into [Difference] (Col1, Col2, ACol1, BCol1)
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Hi,
I would like if there is a difference between two partitionned tables with different structure in term of performance (access, query, insertions, updates ).
I explain myself in detail :
I have a table that stores one value every 10 minutes in a day (so we have 144 values (24*6) in the whole day), with the corresponding id.
Here is the structure :
| Table T1 |
+ id PK |
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Edited by: 998239 on 5 avr. 2013 01:59

I mean storage in tablespaces and datafiles on disk.
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two structures are equivalent ( except inserting data in T(id, date,value)i said
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3) store same type values on diffrent columns is bad practise
http://docs.oracle.com/cd/B28359_01/server.111/b28318/schema.htm#i4383
i remember i seen Toms article about this but now i cant find it sorry ((( if i found i will post here

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I am thinking about something like:
for $COUNTRY in ns0: COUNTRY ()
for $PROD in ns1:PROD()
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<PROD> {fn:data($PROD/PROD_NAME)} </PROD>
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Edited by xnts at 11/19/2007 10:54 AM

Which in general results in not the best performanceI disagree. Only for two tables with very few rows, would a single sql statement give better performance.
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Query the data between two tables

Need help for query the data between two tables
Table 1: Time sheet
P.ID      P.Name EmpID HoursSpend DateTime
c12234  Test      25        4                06/12/2013
c12234  Test      25        7                06/13/2013
c12234  Test      25        8                06/15/2013
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25         05/01/2013    06/30/2013    250
2         04/01/2013    05/31/2013      150
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c12234  Test      25        7                06/13/2013    250      1750
c12234  Test      25        8                06/15/2013    250
2000
c12234  Test      25        4              07/21/2013     300
1200
c12234  Test      2          5              07/15/2013    150
750
===========================================
Total                          28
6700
============================================
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Hi Gopal,
According to your description, it seems that the output needn’t include the row when EmpID=2. Because the DateTime for it in Table1 doesn’t included between FromDate column and ToDate column. After testing the issue in my environment, we can refer to the
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If there are any other questions, please feel free to ask.
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Katherine Xiong
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