运行 #例:A2表示A列第二行 公式表示为,A2,# 新增=CONCATENATE("insert into users (id,code,name) values (null,'",A2,"','",B2,"');")# 修改=CONCATENATE("update users set name = '",B3,"' where code = '",A3,"';")# 删除=CONCATENATE("delete from users where code = '",A2,"';...
INSERT INTO course VALUES('01' , '语文' , '02'); INSERT INTO course VALUES('02' , '数学' , '01'); INSERT INTO course VALUES('03' , '英语' , '03'); --3条记录 SELECT count(1) FROM course; --删除整个表 DROP TABLE IF EXISTS course --查看结果,表不存在(表结构及数据不存在) ...
CREATE TABLE students ( id INT PRIMARY KEY, name VARCHAR(50) NOT NULL, age INT NOT NULL ); 然后,向这个表格中插入数据:INSERT INTO students (id, name, age) VALUES (1, 'Alice', 18), (2, 'Bob', 19), (3, 'Charlie', 20); 最后,使用以下 SQL 语句将Alice 的记录删除:...
FROM 一个可选关键字,可用在 DELETE 关键字与目标 table_or_view_name 或 rowset_function_limited 之间 。 table_alias 在表示要从中删除行的表或视图的 FROMtable_source子句中指定的别名。 server_name 适用于:SQL Server 2008 (10.0.x) 及更高版本。
CREATE TABLE IF NOT EXISTS`test`( `id` INT(4) NOT NULL AUTO_INCREMENT, `col` VARCHAR(20) NOT NULL, PRIMARY KEY(`id`) )ENGINE=INNODB DEFAULT CHARSET=utf8 INSERT INTO `test`(`col`)VALUES('1'),('2'),('3') DELETE FROM `test` -- 不会影响自增 TRUNCATE TABLE `test` -- 自增...
This article describes how to delete table columns in SQL Server using SQL Server Management Studio (SSMS) or Transact-SQL.تنبيه When you delete a column from a table, the column and all the data it contains are deleted....
1要从数据库中删除一个表,应该使用的SQL语句是( )。 A.ALTER TABLE B.KILL TABLEC.DELETE TABLE D.DROP TABLE 2要从数据库中删除―个表,应该使用的SQI语句是___。 A.ALTER TABLEB.KILL TABLEC.DELETE TABLED.DROP TABLE 3要从数据库中删除一个表,应该使 用的SQL语句是( ) A. ALTER TABLE B. ...
JDBC中 execute与executeUpdate的区别 execute与executeUpdate的区别 步骤 1 : 相同点 execute与executeUpdate的相同点:都可以执行增加,删除...c.createStatement();) { String sqlInsert = “insert into Hero values (null,’盖伦’,616,100)”; String sqlDelete...Hero where id = 100”; String sqlUpdate =...
The DELETE statement in SQL can delete multiple rows by specifying a condition that matches more than one row. Example: CREATE TABLE orders (order_id INT PRIMARY KEY,customer_id INT,status VARCHAR(50));INSERT INTO orders (order_id, customer_id, status) VALUES(101, 1, 'Pending'),(102, ...
2、语法DROP TABLE [IF EXISTS] [db_name.]table_name;说明：SQL中加[IF EXISTS] ，可以防止因表...