How to not "duplicate" a table if it has a unique constraint over many columns?
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How to make unique check without creating heavy index in postgres
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Column name or number of supplied values does not match table definition
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How to check if a Constraint exists in Sql server?
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Adding a constraint to prevent duplicates in SQL Update Trigger
54573
adding CHECK to impose constraints on more than one table
108071
Find unique columns and column membership
128373
How do I delete unique rows from a table with duplicate keys?
41952
Add NOT NULL constraint to large table without table scan
67443
How to prevent duplicate records being inserted with SqlBulkCopy when there is no primary key
28765
how to delete duplicate rows from a table in mysql
16236
Is it possible to enforce unique values in a column, excluding nulls?
42554
What to do with too many columns in a table?
148344
Can you prevent more than X number of rows being updated in SQL Server?
91887
Select statement to find duplicates on certain fields
125265
how to set a column as unique indexer on Sqlite
110393
How to avoid duplicates while updating a MySQL database?
98961
Delete duplicate records in SQL Server?