postgresql primary key
A primary key is a column or a group of columns used to identify a row uniquely in a table. You define primary keys through primary key constraints. Technically, a primary key constraint is the combination of a not-null constraint and a UNIQUE constraint.,,A primary key indicates that a column or group of columns can be used as a unique identifier for rows in the table. (This is a direct consequence of the definition ... ,PostgreSQL automatically creates an index for each unique constraint and primary key constraint to enforce uniqueness. Thus, it is not necessary to create an index explicitly for primary key columns. ,A primary key constraint indicates that a column, or group of columns, can be used as a unique identifier for rows in the table. This requires that the values be ... ,A primary key constraint indicates that a column, or group of columns, can be used as a unique identifier for rows in the table. This requires that the values be ... ,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 ... ,A primary key constraint indicates that a column, or group of columns, can be used as a unique identifier for rows in the table. This requires that the values be ... ,This PostgreSQL tutorial explains how to create, alter, or drop a primary key in PostgreSQL with syntax and examples. In PostgreSQL, a primary key is a single ...
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 postgresql primary key 相關參考資料
PostgreSQL Primary Key - PostgreSQL Tutorial
A primary key is a column or a group of columns used to identify a row uniquely in a table. You define primary keys through primary key constraints. Technically, a primary key constraint is the combin... http://www.postgresqltutorial. PostgreSQL PRIMARY KEY constraint - w3resource
https://www.w3resource.com PostgreSQL: Documentation: 8.1: Constraints
A primary key indicates that a column or group of columns can be used as a unique identifier for rows in the table. (This is a direct consequence of the definition ... https://www.postgresql.org PostgreSQL: Documentation: 9.0: CREATE TABLE
PostgreSQL automatically creates an index for each unique constraint and primary key constraint to enforce uniqueness. Thus, it is not necessary to create an index explicitly for primary key columns. https://www.postgresql.org PostgreSQL: Documentation: 9.2: Constraints
A primary key constraint indicates that a column, or group of columns, can be used as a unique identifier for rows in the table. This requires that the values be ... https://www.postgresql.org PostgreSQL: Documentation: 9.4: Constraints
A primary key constraint indicates that a column, or group of columns, can be used as a unique identifier for rows in the table. This requires that the values be ... https://www.postgresql.org PostgreSQL: Documentation: 9.4: Unique Indexes
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 ... https://www.postgresql.org PostgreSQL: Documentation: 9.6: Constraints
A primary key constraint indicates that a column, or group of columns, can be used as a unique identifier for rows in the table. This requires that the values be ... https://www.postgresql.org PostgreSQL: Primary Keys - TechOnTheNet
This PostgreSQL tutorial explains how to create, alter, or drop a primary key in PostgreSQL with syntax and examples. In PostgreSQL, a primary key is a single ... https://www.techonthenet.com |