Returning same value set in a group.

Question

All,
i have the below requirement,
i got a table(deptid, deptname, address,city,zip, state, other columns) i want to write a query to determine any error(records with different values) because i expect all records grouped-by(deptid, deptname, address,city,zip, state) to have the same deptid(pls note that deptid isnt unique),
or a specific deptid should have only one record based on the groupping (deptid, deptname, address,city,zip, state),
any suggestion? thanks.

Answer 1

Hi,
Gor_Mahia wrote:
All,
i have the below requirement,
i got a table(deptid, deptname, address,city,zip, state, other columns) i want to write a query to determine any error(records with different values) because i expect all records grouped-by(deptid, deptname, address,city,zip, state) to have the same deptid(pls note that deptid isnt unique),
or a specific deptid should have only one record based on the groupping (deptid, deptname, address,city,zip, state),
any suggestion? thanks.Normalize your tables. If a deptid is supposed to have (at most) 1 name, 1 address, 1 city, 1 state and 1 zip, then all that information should be stored in a table that has a unique deptid. Other tables would store only the deptid. See the tables dept and emp in the scott schema for an example. The same deptno can be used on many rows of scott.emp, but the name and location of each deptno is stored only once, in scott.dept.
This is something very basic, and very important, to table design. Relational databases (such as Oracle) are designed to work with normalized tables. If you design tables with redundant information, you risk inefficiency, complicated code and errors. Do yourself a huge favor: learn about the normal forms and use them when creating tables. Many shops only allow specialists to design tables, because they know how important it is to get a good table design.
If you want to see which deptids have problems in your current arrangement, then you can do something like this:
SELECT    deptid
,       COUNT (DISTINCT deptname)     AS deptname_cnt
,       COUNT (DISTINCT address)     AS address_cnt
,       COUNT (DISTINCT city)          AS city_cnt
,       COUNT (DISTINCT state)     AS state_cnt
,       COUNT (DISTINCT zip)          AS zip_cnt
FROM       table_x
GROUP BY  deptid
HAVING       COUNT (DISTINCT deptname)     > 1
OR       COUNT (DISTINCT address)     > 1
OR       COUNT (DISTINCT city)          > 1
OR       COUNT (DISTINCT state)     > 1
OR       COUNT (DISTINCT zip)          > 1
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all tables involved, and also post the results you want from that data.
Explain, using specific examples, how you get those results from that data.
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all tables involved, and also post the results you want from that data.
Explain, using specific examples, how you get those results from that data.
Always say which version of Oracle you're using (e.g., 11.2.0.2.0).
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