postgres create unique index multiple columns:Documentation
Documentation
Anindexcanbedefinedonmorethanonecolumnofatable.Forexample,ifyouhaveatableofthisform:CREATETABLEtest2(majorint,minorint, ...。其他文章還包含有:「PostgreSQLUNIQUEIndex」、「InPostgresql」、「PostgreSQLmulti」、「Documentation」、「HowtoAddorRemoveaUNIQUEConstraintonMultiple...」、「Postgres」、「PostgreSQLUniqueConstraints」、「HowtosafelycreateuniqueindexesinPostgreSQL」、「PostgreSQL」
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https://www.postgresqltutorial
In this tutorial, you will learn how to create a PostgreSQL UNIQUE index to ensure the uniqueness of values in one or more columns.
In Postgresql
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Create unique constraint that two numbers together CANNOT together be repeated: ALTER TABLE someTable ADD UNIQUE (col1, col2). Share. Share a ...
PostgreSQL multi
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Adding a unique constraint will automatically create a unique B-tree index on the column or group of columns listed in the constraint.
Documentation
https://www.postgresql.org
PostgreSQL automatically creates a unique index when a unique constraint or primary key is defined for a table. The index covers the columns that make up the ...
How to Add or Remove a UNIQUE Constraint on Multiple ...
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In PostgreSQL, the “UNIQUE” keyword is used with the CREATE TABLE or ALTER TABLE commands to add a unique constraint on single/multiple columns ...
Postgres
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An alternative to the good solution of forbidding NULLs is to create a unique index. All you need is a value that is guaranteed not to occur in your data set.
PostgreSQL Unique Constraints
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A Unique constraint can be defined on multiple columns by specifying it at table level. Syntax: Multi-column Unique Constraint. CREATE TABLE table_name ( ...
How to safely create unique indexes in PostgreSQL
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Attempt 1 - Creating a unique index ... Looking at PostgreSQL documentation, you could just use the statement below to create a new unique index.
PostgreSQL
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In PostgreSQL, a UNIQUE index is used to ensure that the values in one or more columns are unique across the rows in a table.