sql / expert
Snippet
Data Integrity Validation with EXCEPT
The EXCEPT operator returns distinct rows from the first query that are not present in the second. This is essential for delta detection, data migration validation, and identifying missing records across datasets.
snippet.sql
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SELECT product_id, vendor_id FROM inventory_stagingEXCEPTSELECT product_id, vendor_id FROM master_catalog;
Breakdown
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SELECT product_id, vendor_id FROM inventory_staging
Selects the source dataset for comparison.
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EXCEPT
Calculates the set difference between the two queries.
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SELECT product_id, vendor_id FROM master_catalog
Selects the reference dataset to subtract from the first set.