PostgreSQL create UNIQUE index
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 ... ,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 ... ,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. ,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 ... , ,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 ... ,CREATE INDEX. Name. CREATE INDEX -- define a new index. Synopsis. CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [ IF ... ,ALTER TABLE employees ADD mobile_phone VARCHAR(20); · CREATE UNIQUE INDEX idx_employees_mobile_phone ON employees(mobile_phone); · ALTER ... ,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 ...
| 相關軟體 PostgreSQL (64-bit) 資訊 | |
|---|---|
 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 |