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Posted by --CELKO-- on 12/28/06 18:01
Why did you fail to post DDL, screw up the syntax and violate ISO-11179
naming rules? Probably because you also confuse fields and columns.
Let's start by cleaning up you code, so it looks like SQL.
SQL uses single quotes for strings. A data element can be a location or
an identifier, never both. A transaction is some kind of transaction.
Etc. You need a data modeling course. Your sample data failed to give
values of the improperly named 'EmployeeLocationID' - I hope to
ghod you are not using IDENTITY and thinking that it is a key!!
Don't you know about SAN and other industry standard address numbers?
>> A(Lookup table) and B(Transaction Table) <<
Why did you avoid clear names?
CREATE TABLE LocationCodes
(loc_prefix VARCHAR(5) NOT NULL PRIMARY KEY,
loc_code INTEGER NOT NULL); -- industry SAN ??
-- put wildcards in the table for indexing
INSERT INTO LocationCodes VALUES ('B%', 100);
INSERT INTO LocationCodes VALUES ('BO%', 101);
INSERT INTO LocationCodes VALUES ('BOM%', 102);
Etc.
Can two prefixes belong to the same SAN? No specs given.
Without a key in that vague transactions table, you do not have a
proper table at all. I had to make up one. Why do you have employee
id and not find the employee name via a join to the Personnel table?
Isn't the idea of RDBMS to get rid of redudant data?
CREATE TABLE FoobarTrans
(foobar_trans_nbr INTEGER NOT NULL PRIMARY KEY,
-- CHECK (<<needs validation rule here>>),
emp_id INTEGER NOT NULL
REFERENCES Personnel(emp_id)
ON UPDATE CASCADE,
loc_code INTEGER NOT NULL
REFERENCES LocationCodes(loc_code)
ON UPDATE CASCADE,
Etc.);
The prefix should have been used when you inserted the initial row (NOT
field!!!) into the table. Because you are confusing fields and
columns, files and tables, you are thinking in procedural *steps* with
updates just like a punch card file, not in sets like an SQL
programmer.
>> I hope you get where I am leading this to, from my examples.. <<
No. Clear specs would have been nice, along with real DDL.
Here is a skeleton of a proc for this. You can put Roy's SELECT TOP
in the VALUES list, but if you have SQL-2005, try this little untested
statement:
INSERT INTO FoobarTrans (foobar_trans_nbr, emp_id, ..)
VALUES (@my_foobar_trans_nbr, @my_emp_id,
(WITH (SELECT L1.loc_code, LEN(L1.loc_prefix)
FROM LocationCodes AS L1
WHERE L1.loc_prefix LIKE @my_loc_prefix)
AS M(loc_code, fit)
SELECT loc_code
FROM M AS M1
WHERE M1.fit
= (SELECT MAX(M2.fit) FROM M AS M2)),
Etc.);
You will need error handling code for prefixes that do not match.
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