CREATE TABLE [IF NOT EXISTS] table_name( column_definition1, column_definition2, …….., table_constraints ); 也可简写为: CREATE TABLE table_name (column_name column_type); 上述语法的参数说明如下: 以下例子中我们将在 RUNOON 数据库中创建数据...
The `CREATE TABLE` statement in MySQL is used to define a new table in the database. It specifies the table name, columns, and their data types, along with any constraints. Usage The `CREATE TABLE` statement is used when you need to set up a new table structure in your database to ...
使用SHOW CREATE TABLE命令 查看information_schema.TABLE_CONSTRAINTS视图 查看information_schema.CHECK_CONSTRAINTS视图 constraint_name约束名称,最多包含 64 个字符。 约束名称的开头结尾中间都允许有空格,但需要用"`"标识名称的开头和结尾。 约束名称可以包含特殊字符"$"。
In MySQL, the name of aPRIMARY KEYisPRIMARY. For other indexes, if you do not assign a name, the index is assigned the same name as the first indexed column, with an optional suffix (_2,_3,...) to make it unique. You can see index names for a table usingSHOW INDEX FROMtbl_nam...
SELECT statements when row-based replication is in use. Foreign key constraints can be added later using ALTER TABLE. You can precede the SELECT by IGNORE or REPLACE to indicate how to handle rows that duplicate unique key values. With IGNORE, rows that duplicate an existing row on a ...
GET /api/v2/instances/{instanceId}/tenantCreateConstraints 请求参数 Query 名称类型是否必选描述示例值 instanceId String 是 OceanBase 集群 ID。 ob317v4uif*** tenantId String 是 租户ID。 t33h8y08k*** tenantMode string 是 租户模式。 当前支持 Oracle 模式(Oracle)、MySQL 模式(MySQL)。 Oracle...
Auto generate create table script for SQL. Create a Table using the GUI. A table can have multiple columns, with each column definition consisting of a.
The statement shows available columns in the table. We see the newly added column. It is possible to add constraints to the table. mysql> ALTER TABLE TestTable ADD PRIMARY KEY (Id); We add aPRIMARY KEYconstraint to theTestTable.
Storage enginesmay place additional constraints on this limit, reducing the effective maximum row size. MySQL DESCRIBE statement MySQL DESCRIBE statement is used to show the structure of the created table. Syntax: DESCRIBE [table_name]; The following statement will display the structure of a given ...
Creates a new empty table in the current database.This table is owned by the user who executes the command. However, if the system administrator creates a table in the sc