在数据库的操作中,更新数据,是很常见的情况。其中sql 请教update语句in多个值时,进行多次更新的方法为:1、创建一个临时表,用于演示sqlserver语法中update更新修改使用方法。2、创建另外一个临时表,用于演示如何将一个临时表的数据更新到另外一个临时表。3、往临时表中插入几行测试数据,其中的Total栏...
WHERE column_name = alias.column_name) WHERE column_name = VALUE 下面是这样一个例子: 两个表a、b,想使b中的memo字段值等于a表中对应id的name值 表a: 1 2 3 4 id name 1 王 2 李 3 张 表b: 1 2 3 4 id ClientName 1 2 3 (MS SQL Server)语句: 1 UPDATE b SET ClientName = a.na...
WHERE table1.column2= value; 注:若不加where条件则是更新表中的所有数据, 故执行没有where子句的update要慎重再慎重。 实例: UPDATE tb_bookcase SET name= (SELECT bookname FROM tb_bookinfo WHERE tb_bookinfo.type =tb_bookcase.type AND tb_bookinfo.ord_date IN (SELECT MAX(ord_date) FROM tb_book...
in/exists 子查询in 子查询下优化器实现: UPDATE pay_stream a SET a.return_amount = 0 WHERE a.pay_id IN (SELECT b.pay_id FROM pay_main b WHERE b.user_name = '1388888888'); id select_type table partitions type possible_keys key key_len ref rows filtered Extra --- --- --- ---...
1、创建两个测试表,create table test_up_a(id number, value varchar2(100));create table test_up_b(id number, value varchar2(100));2、分别往两个表中插入数据;insert into test_up_a values(1,'A1');insert into test_up_a values(2,'A2');insert into test_up_a values(3,...
update a set value = 'test' from a join b on a.b_id = b.id join c on b.c_id = c.id where a.key = 'test' and c.value = 'test'; 按照上边的sql,本意是a、b、c三表关联,当c的value是’test’且a的key也是’test’的时候,就将a的value也改为’test’。但实际上这个sql有大问题,...
SQL Server supports the standard SQL to update the data in the table. Use the UPDATE TABLE statement to update records in the table in SQL Server. Syntax: UPDATE table_name SET column_name1 = new_value, column_name2 = new_value, ... [WHERE Condition]; ...
ID Value --- --- 1 100 2 200 (2 row(s) affected) 使用不正确匹配的 CTE 引用的 UPDATE 语句。 SQL 复制 USE tempdb; GO DECLARE @x TABLE (ID INT, Value INT); DECLARE @y TABLE (ID INT, Value INT); INSERT @x VALUES (1, 10), (2, 20); INSERT @y VALUES (1, 100),(2...
SETcolumn1=value1,column2=value2, ... WHEREcondition; Note:Be careful when updating records in a table! Notice theWHEREclause in theUPDATEstatement. TheWHEREclause specifies which record(s) that should be updated. If you omit theWHEREclause, all records in the table will be updated!
Update table_name Set column_name1 = value1, column_name2 = value2... Where conditions; 如果不指明Where的话,那么更动就会应用到所有的纪录内。 1928年,董必武同志亦来到了列宁学院学习,为了避免写出两条语句,我们需要在一条更新语句里面同时更动董必武和陈潭秋同志的教育学校,我们可以用in关键字来做多纪录...