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如何用索引创建MySQL表？

2024-04-23 12:17:03 449

要创建带有索引的MySQL表，语法如下-

create table yourTableName
(
yourColumnName1 dataType,
yourColumnName2 dataType
.
.
.
N
);
create index yourIndexName1 on(yourColumnName1 );
create index yourIndexName2 on(yourColumnName2 );

让我们首先创建一个表-

mysql> create table DemoTable
   -> (
   -> Id int,
   -> Name varchar(20)
   -> );

这是使用表创建索引的查询-

mysql> create index id_index on DemoTable(Id);
Records: 0 Duplicates: 0 Warnings: 0
mysql> create index Name_index on DemoTable(Name);
Records: 0 Duplicates: 0 Warnings: 0

现在您可以检查表的结构-

mysql> show create table DemoTable;

这将产生以下输出-

+---------------+-----------------------------------------------------------------------------------------+
| Table         | Create Table                                                                            |  
+---------------+-----------------------------------------------------------------------------------------+
| DemoTable     | CREATE TABLE `DemoTable` ( `Id` int(11) DEFAULT NULL, `Name` varchar(20) COLLATE                               utf8_unicode_ci DEFAULT NULL, KEY `id_index` (`Id`), KEY `Name_index` (`Name`) )                            ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci                             |
+---------------+------------------------------------------------------------------------------------------+
1 row in set (0.05 sec)

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如何用索引创建MySQL表？

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