postgresql创建索引语句
时间: 2023-09-29 18:06:18 浏览: 57
在PostgreSQL中,创建索引的语法如下:
CREATE INDEX index_name ON table_name (column_name);
其中,index_name是你给索引起的名字,table_name是你要在哪个表上创建索引,column_name是你要在哪个列上创建索引。这个语句可以在单列上创建索引。
另外,还有一种创建组合索引的方式,即在多个列上创建索引。基本语法如下:
CREATE INDEX index_name ON table_name (column1_name, column2_name);
此外,你还可以创建唯一索引,即保证被索引的列的值是唯一的。创建唯一索引的语法如下:
CREATE UNIQUE INDEX index_name on table_name (column_name);
如果你想删除索引,可以使用DROP INDEX语句:
DROP INDEX index_name;
以上是PostgreSQL中创建索引的语法。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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