PostgreSQL create UNIQUE index
To create a unique B-tree index on the column title with included columns director and rating in the table films : CREATE UNIQUE INDEX title_idx ON films (title) ... ,Indexes can also be used to enforce uniqueness of a column's value, or the uniqueness of the combined values of more than one column. CREATE UNIQUE ...
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 PostgreSQL create UNIQUE index 相關參考資料
11.6. 唯一值索引- PostgreSQL 正體中文使用手冊
CREATE UNIQUE INDEX name ON table (column [, ...]); 目前，只能將B-tree 索引宣告為唯一。 當索引宣告為唯一時，不允許具有相等索引值有多筆資料。但空值 ... https://docs.postgresql.tw CREATE INDEX - PostgreSQL 正體中文使用手冊
To create a unique B-tree index on the column title with included columns director and rating in the table films : CREATE UNIQUE INDEX title_idx ON films (title) ... https://docs.postgresql.tw Documentation: 13: 11.6. Unique Indexes - PostgreSQL
Indexes can also be used to enforce uniqueness of a column's value, or the uniqueness of the combined values of more than one column. CREATE UNIQUE ... https://www.postgresql.org Documentation: 9.0: CREATE INDEX - PostgreSQL
To use a user-defined function in an index expression or WHERE clause, remember to mark the function immutable when you create it. Parameters. UNIQUE. https://www.postgresql.org Documentation: 9.1: CREATE INDEX - PostgreSQL
CREATE INDEX constructs an index on the specified column(s) of the specified table. ... Another possible application is to use WHERE with UNIQUE to enforce ... https://www.postgresql.org Documentation: 9.3: Unique Indexes - PostgreSQL
https://www.postgresql.org Documentation: 9.4: Unique Indexes - PostgreSQL
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 Documentation: 9.5: CREATE INDEX - PostgreSQL
CREATE INDEX. Name. CREATE INDEX -- define a new index. Synopsis. CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [ IF ... https://www.postgresql.org PostgreSQL UNIQUE Index - PostgreSQL Tutorial
ALTER TABLE employees ADD mobile_phone VARCHAR(20); · CREATE UNIQUE INDEX idx_employees_mobile_phone ON employees(mobile_phone); · ALTER ... https://www.postgresqltutorial PostgreSQL 筆記— 索引| by 愷開| De-Magazine | Medium
2017年12月12日 — 雖然在大部分的情況，直接使用 CREATE INDEX 的語法已經能夠應付常見的開發場景， ... 在 PostgreSQL 中可以透過SQL 語法來建立索引。 ... 來避免鎖表; CREATE UNIQUE INDEX 可透過unique 來確保值的唯一性; INDEX 可以 ... https://medium.com |