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...
1、 创建一个部门表tb_dept1,SQL语句如下 mysql> CREATE TABLE tb_dept1 -> ( -> id INT(11) PRIMARY KEY, -> name VARCHAR(22) NOT NULL, -> location VARCHAR(50) -> ); Query OK, 0 rows affected, 1 warning (0.01 sec) 1. 2. 3. 4. 5. 6. 7. 8. 2、 创建数据表tb_emp5SQL语...
$retval=mysqli_query($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...
Name: ‘CREATE TABLE’Description:Syntax:CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name(create_definition,…)[table_options]CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name[(create_definition,…)][table_options][partition_options][IGNORE | REPLACE][AS] query_expressionCREATE [TEMPORARY] TA...
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...
For example: mysql> CREATE TABLE names (myname CHAR(10)); Query OK, 0 rows affected (0.03 sec) mysql> INSERT INTO names VALUES ('Monty'); Query OK, 1 row affected (0.00 sec) mysql> SELECT myname = 'Monty', myname = 'Monty ' FROM names; +---+---+ | myname = 'Monty' |...
03 sec) mysql> insert into student values (2,1001,'唐三藏',1235); Query OK, 1 row affected (0.02 sec) --查看插入结果 mysql> select * from student; +---+---+---+---+ | id | sn | name | qq | +---+---+---+---+ | 1 | 1000 | 孙悟空 | 1234 | | 2 | 1001 ...
)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`...
Query:createfunctionNameByT()returnchar(50)return(select name from t3 where id=2)Error Code:1064You have an errorinyourSQLsyntax;check the manual that corresponds to your MySQL server versionforthe right syntax to use near 'returnchar(50)return(select name from t3 where id=2)' at line2Exe...