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SQL CASE Statement for Conditional Logic in Data Handling

This SQL code snippet utilizes a CASE statement to handle various conditions based on the values of DCMV and RCMV variables. If both variables contain invalid values (not in "Y" or "N"), it returns an error message "***.ERROR.***". When both variables are empty, the output is "BB". If only DCMV is empty, the result combines "B" and RCMV, and vice versa. If both variables are populated, it concatenates their values. This structure facilitates robust data validation and user-friendly output in SQL environments.

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SQL CASE Statement for Conditional Logic in Data Handling

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  1. Data step code SQL or the GUI • CASE • when (DCMV notin ("", "Y","N") or RCMV notin ("", "Y", "N")) then"*** ERROR ***" • when (DCMV=""and RCMV ="") then"BB" • when (DCMV="") then catt("B", RCMV) • when (RCMV="") then catt(DCMV, "B") • else catt(DCMV, RCMV) • END

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