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+-- Make zone_code required and unique
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+-- This ensures data integrity for audits and lookups
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+
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+-- First, modify the column to be NOT NULL
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+ALTER TABLE `zones` MODIFY `zone_code` VARCHAR(50) NOT NULL;
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+
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+-- Then add the unique constraint
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+ALTER TABLE `zones` ADD UNIQUE KEY `unique_zone_code` (`zone_code`);
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