This program does PL/SQL has a meaning?
HelloIn the book of Ivan Bayross, page no. 331 of the following program is given.
If no transaction on the last 365 days, mark INACTIVE account status
Le mANS is defined as varchar
mACCT_NO comes from the user
ACCNT_NO is a column of Table TRANS_MASTER
CHOOSE 'YES' IN the mANS
OF TRANS_MASTER
WHERE
ACCNT_NO = mACCT_NO
GROUP BY
ACCNT_NO
HAVING
MAX (SYSDATE - DT ) > 365;
IF mANS = "YES" THEN
GOTO mark_status;
ON THE OTHER
dbms_output.put_line (' number of ACCT | mACCT_NO |) (' is Active');
The program continues...
But,
DT IS DEFINED NOWHERE / / this IS the ERROR?
Is there a sense program? I mean, check out the select query above. Why is the need for Group by and having clause? Cant we use where simple clause there?
DT should be the field in the TRANS_MASTER table.
You cannot use a simple where clause until ACCOUNT_NO is unique. As the name tells you it is an operating table that I hope the transaction for an account on different dates.
So if I need to find if and the account is INACTIVE I need to get the date of the last transaction and verify how old it from today (SYSDATE).
To do this I need a function GROUP BY and MAX.
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