Postgres Phone Number Constraint

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PostgreSQL UNIQUE Index

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Code language: CSS (css) Note that only B-tree indexes can be declared as unique indexes. When you define an UNIQUE index for a column, the column cannot store multiple rows with the same values.. If you define a UNIQUE index for two or more columns, the combined values in these columns cannot be duplicated in multiple rows.. PostgreSQL treats NULL as distinct value, …

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See Also:What Are Unique Numbers, How To Find Gce O L Index Number, Verify It   Show details

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