$retval=mysqli_query($conn,$sql); if(!$retval) { die('数据表创建失败: '.mysqli_error($conn)); } echo"数据表创建成功\n"; mysqli_close($conn); ?> 执行成功后,就可以通过命令行查看表结构: mysql>useRUNOON; Readingtableinformationforcomp...
SET @table_name = CONCAT('table_', i);语句用于动态生成表名,如table_1、table_2等。SET @query = CONCAT('CREATE TABLE ', @table_name, ' (id INT)');语句用于动态生成创建表的SQL语句,其中@table_name是动态生成的表名。PREPARE stmt FROM @query;语句用于准备执行动态生成的SQL语句。EXECUTE stmt...
mysql> insert into t10 values(1,'duoo','drinkhothotwater'); Query OK, 1 row affected (0.03 sec) mysql> select * from t10; +---+---+---+ |id| name | hobby | +---+---+---+ | 1 | duoo | drinkhothotwater | +---+---+---+ 1 rowinset(0.00 sec) (3)char_length...
PT_create_table_optionand sub classes, for table options. PT_table_elementand sub classes, for the columns, indexes, etc. The collection of nodes returned after the bison parsing is known as the "Abstract Syntax Tree" that represents a SQL query. ...
query_expression:SELECT … (Some valid select or union statement)CREATE TABLE creates a table with the given name. You must have theCREATE privilege for the table.By default, tables are created in the default database, using theInnoDB storage engine. An error occurs if the table exists, if ...
)ENGINE=INNODB AUTO_INCREMENT=6DEFAULTCHARSET=utf8;/*1:Data for the table `grade`*/INSERTINTO`grade`(`GradeID`,`GradeName`)VALUES(1,'大一'),(2,'大二'),(3,'大三'),(4,'大四'),(5,'预科班');/*2:Table structure for table `result`*/DROPTABLEIFEXISTS`result`;CREATETABLE`result`...
Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed MariaDB [twle]> CREATE TABLE IF NOT EXISTS `tbl_language`( -> `id` INT UNSIGNED AUTO_INCREMENT, ...
(0.00 sec) mysql> delete from for_delete; Query OK, 3 rows affected (0.04 sec) mysql> insert for_delete (name) values ('D'); Query OK, 1 row affected (0.02 sec) mysql> select * from for_delete; +---+---+ | id | name | +---+---+ | 4 | D | +---+---+ 1 row...
SQL是Structured Query Language的缩写,是用于访问数据库的标准化语言。SQL由三部分组成: 数据定义语言:这些语句可帮助你定义数据库及其相关对象,例如表。 数据操作语言:包含允许你更新和查询数据的语句。 数据控制语言:允许你授予用户访问数据库中特定数据的权限。
SQL,指结构化查询语言,全称是 Structured Query Language,是一种 ANSI(American National Standards Institute 美国国家标准化组织)标准的计算机语言,可以让我们可以处理数据库。 SQL语句主要分为: DQL:数据查询语言,用于对数据进行查询,如select DML:数据操作语言,对数据进行增加、修改、删除,如insert、udpate、delete DD...