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...
[as] query_expression 根据一个查询结果集,创建一个包含这些数据的新表。 CREATETABLEnew_tblASSELECT*FROMorig_tbl; IGNORE | REPLACE 这两个选项表明,当根据select语句创建表时,该如何处理复制唯一键值的行。(how to handle rows that duplicate unique key values when copying a table using a SELECT stateme...
If you prefer you can also run commands from a command line to create a table. A lot of web hosts don't give you shell access to the server anymore, or allow remote access to the MySQL servers. If you want to do it this way you may have to install MySQL locally, or try thisnift...
mysql> create table t9(name char(4)); # 超出四个字符报错,不够四个 就用字符空格补全 Query OK, 0 rows affected (0.04 sec) mysql> create table t10(name varchar(4)); # 超出四个字符报错,不够四个有几个就存几个 Query OK, 0 rows affected (0.04 sec) mysql> insert into t9 values('...
CREATE TABLE <表名>( 字段名1 数据类型 [列级别约束条件] [默认值], 字段名2 数据类型 [列级别约束条件] [默认值], …… [表级别约束条件] );使用CREATE TABLE创建表时,必须指定以下信息: 要创建的表的名称,不区分大小写,不能使用SQL语言中的关键字,如DROPALTER, INSERT等。 数据表中每一个列(字段...
You can probably think of other types of information that would be useful in the pet table, but the ones identified so far are sufficient: name, owner, species, sex, birth, and death. Use a CREATE TABLE statement to specify the layout of your table: ...
)][table_options][partition_options][IGNORE | REPLACE][AS] query_expressionCREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name{ LIKE old_tbl_name | (LIKE old_tbl_name) } 有意思的是，这次看到的语法结构，与之前学习的创建数据库 语法结构 很像，但又不像。分为三段，这是因为创建数据表，可以用...
When a query is sent to the server, the first step is to invoke the bison parser to build an Abstract Syntax Tree to represent the query text. Assume the following statement: CREATE TABLE test.t1 (a int) ENGINE = "INNODB"; In the bison grammar file, the rule implementing the CREATE ...
创建一个数据表 名为 前缀sites 数据表里有以下字段 site_id 整数型不为空的主键 url varchar 255 title varchar 255 short_desc text indexdate date spider_depth 整数型 默认为2 required text disallowed text can_leave_domain bool
delete from table_name [where ...] [order by ...] [limit ...]; 删除孙悟空同学的考试成绩 代码语言:javascript 代码运行次数:0 运行 AI代码解释 mysql> delete from exam_result where name = '孙悟空'; Query OK, 1 row affected (0.00 sec) mysql> select * from exam_result where name = ...