I recently found myself forgetting the exact syntax to update a value in a table based on the sum of another set of values in another. You cannot, for example, do this: UPDATEmSETm.Foo=SUM(s.valsum)FROM[MASTER]mINNERJOIN[Foos]sONs.ID=m.ID But you can do it with the following sub...
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,...
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...
c、更新时,如果有类似create_date 不为空而且没有默认值的列,需要在key和value中添加,但最后更新的列中不一定包含此列。 ex: insert into table (aa,bb,create_date) values (xx,xx,now()) on duplicate key update aa = values(aa),bb=value(bb) 批量替换更新[sql] view plain copyreplace into ...
假设User有三个字段，username，age，password。我们在前端传过来的数据为username和age，不能修改password...
Arrays - Finding Highest and Lowest Values in an array asenumerable is not a member of system.data.datatable Asign an array to a Combobox.Items --VB.NET Assign 'Enter' key to a button? Assign DBNull.Value to a variable, or: write NULL to MSSQL database Assign text box input to ...
Re: Update from another table where partial string exist in other table Sébastien F. May 27, 2022 04:42PM Re: Update from another table where partial string exist in other table Gideon Engelbrecht May 27, 2022 11:54PM Sorry, you can't reply to this topic. It has been closed. ...
Table: t CreateTable:CREATETABLE`t` ( `id`int(11)NOTNULL, `num`int(11)DEFAULTNULL,PRIMARYKEY (`id`) ) ENGINE=InnoDBDEFAULTCHARSET=utf8 1 row in set (0.00 sec) mysql> select * from t; Empty set (0.00 sec) mysql> insert intot(id, num)values(1,100); ...
WITH <common_table_expression> 指定在 UPDATE 语句作用域内定义的临时命名结果集或视图,也称为公用表表达式 (CTE)。 CTE 结果集派生自简单查询并由 UPDATE 语句引用。 公用表表达式还可与 SELECT、INSERT、DELETE 和 CREATE VIEW 等语句一起使用。 有关详细信息,请参阅WITH common_table_expression (Transact-SQL...
Re: How to update field in table with sum of values from a second table James Cobban May 21, 2010 01:35PM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by...