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32 Complex SQL queries
Top selected Complex SQL queries frequently asked in all interviews of top software companies.
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1). How to process 2 files by comparing key fields in COBOL?
Solution-1:
- Read the records in both the first file and the second file. If the key field matches, you can ignore it.
- Let us say T, M files.
- T < M means this is a new account so we need to update in the master file
- T > M means an account is missing in the Master file, so we need to update it
Solution-2:
- If both files are the same number of records. It is good, our work is reduced
- If T file comes to AT END you need to move HIGH VALUES into the key field
- If M files come to AT END you need to move HIGH VALUES into the key field
- So you need to process till both key fields are equal to HIGH VALUES.
Note: Key fields must be in PIC (X) not numeric
Solution-3:
- To avoid a lot of I/Os, you can read data into a local array table, and you can process the records.
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