In this tutorial, we will review the syntax, features, and options of the CREATE TABLE command in PostgreSQL. CREATE TABLE The CREATE TABLE statement has many options and features. In this tip, we will review the most important ones and some of the peculiarities of the CREATE TABLE statement...
CREATE INDEX idx_name ON employees (last_name, first_name); ``` ### 检查索引 创建索引后,可以通过以下查询检查索引的存在: ```sql SELECT * FROM pg_indexes WHERE tablename = 'table_name'; ``` 替换“table_name”为你的表格名称。 ## 结论 通过以上步骤,您就可以在PostgreSQL数据库中成功创建...
Create Index in MySQL, PostgreSQL, Oracle, SQL Server Create Index in MySQL [5.7] Without an index, MySQL must begin with the first row and then read through the entire table to find the relevant rows. The larger the table, the more this costs. If the table has an index for the colum...
To removeINDEXfrom a table, we can use theDROP INDEXcommand. For example, SQL Server DROPINDEXColleges.college_index; PostgreSQL, Oracle DROPINDEXcollege_index; MySQL ALTERTABLECollegesDROPINDEXcollege_index; Here, the SQL command removes an index namedcollege_indexfrom theCollegestable. Note:Deletin...
We’ll show you how to create other index types. PostgreSQL CREATE INDEX statement example We’ll use the address table from the sample database for the demonstration: First, connect to the PostgreSQL dvdrental sample database using psql: psql -U postgres -d dvdrental Second, execute the ...
CREATE INDEX code_idx ON films(code) TABLESPACE indexspace; 在不锁定表的情况下创建索引: CREATE INDEX CONCURRENTLY sales_quantity_index ON sales_table (quantity); 兼容性 CREATE INDEX是 PostgreSQL 语言扩展。在 SQL 标准中没有这个命令。 又见 ...
在表films 的字段 code 上创建一个索引, 并且让索引存在于表空间 indexspace上: CREATE INDEX code_idx ON films(code) TABLESPACE indexspace; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 兼容性 CREATE INDEX 是 PostgreSQL 语言扩展。 在 SQL92 中没有 CREATE INDEX ...
tablespace_name:Specify the name of the tablespace. If you do not specify the tablespace, the table will be created inpg_defaulttablespace PostgreSQL supports the following column constraints: PRIMARY KEY:The primary key identifies a record from the table uniquely. A PostgreSQL table can have only...
PostgreSQL Index Create Index Create implicit index postgres=# postgres=# CREATE TABLE products ( postgres(# product_no integer UNIQUE NOT NULL, postgres(# name text, postgres(# price numeric postgres(# ); NOTICE: CREATE TABLE / UNIQUE will create implicit index "products_product_no_key" for...
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