nullable unique constraint ef
// Add unique nullable index
string indexName = "IX_UQ_UniqueColumn";
string tableName = "dbo.ExampleClasses";
string columnName = "UniqueColumn";
Sql(string.Format(@"
CREATE UNIQUE NONCLUSTERED INDEX {0}
ON {1}({2})
WHERE {2} IS NOT NULL;",
indexName, tableName, columnName));how to drop a unique constraint in sql
SHOW CREATE TABLE [tableName]
-- Find the constraintID after CONSTRAINT 'constraintID'
ALTER TABLE [tableName] DROP FOREIGN KEY constraintIDCopyright © 2021 Codeinu
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