sql update if else
Use conditional logic, something like: update t set column1 = coalesce(column1, '123'), column2 = (case when column1 is null then column2 else '123' end);. ,The CASE expression. UPDATE User SET Name = CASE WHEN LEN(@NAME) > 0 THEN @Name ELSE Name END, Password = CASE WHEN ...
相關軟體 MySQL 資訊 | |
---|---|
MySQL 是一個開源的 RDBMS(關係數據庫管理系統),它支持用 C,C ++,Java,Perl 和 PHP 等各種編程語言編寫的請求。由於其高速度和靈活性,MySQL 已成為主要用於開發各種形狀和大小的 Web 應用程序的最流行的數據庫系統之一。自 1995 年上市以來,這種非常受歡迎的開源數據庫管理系統已經應用於當今幾乎所有互聯網用戶的無數項目中。今天一些最受歡迎的 MySQL 用戶是 ... MySQL 軟體介紹
sql update if else 相關參考資料
if condition in sql server update query - Stack Overflow
IF @flag = 1 UPDATE table_name SET column_A = column_A + @new_value WHERE ID = @ID; ELSE UPDATE table_name SET column_B = column_B + ... https://stackoverflow.com if else in sql update query - Stack Overflow
Use conditional logic, something like: update t set column1 = coalesce(column1, '123'), column2 = (case when column1 is null then column2 else '123' end);. https://stackoverflow.com Implementing IF Condition Within a T-SQL UPDATE Statement - Stack ...
The CASE expression. UPDATE User SET Name = CASE WHEN LEN(@NAME) > 0 THEN @Name ELSE Name END, Password = CASE WHEN ... https://stackoverflow.com SQL IF EXISTS update else insert @ 風箏:: 痞客邦::
SQL IF EXISTS update else insert. 連最基本的都記不太住,老囉!! 以下提供的是一般在大量倒資料時,會用到的,請僅慎使用!! 哈! http://lernju.pixnet.net sql server - How to Update a Column Using CASE Statement with More ...
There are two possibilities here. There is a limitation with linked servers that only allows a nest level of 10 when using CASE expressions. https://dba.stackexchange.com SQL UPDATE using an IF statement - Stack Overflow
check and keep old or update with new, same for other fields: UPDATE cu SET [sentbirth] = CASE WHEN cu.[sentbirth] = '1' THEN cu.[sentbirth] ... https://stackoverflow.com Update same table with IF ELSE Condition in MySQL - Stack Overflow
try the following update pm_users set user_status = case when user_status = 0 then 1 else 0 end where user_id = 3 ... SQL Fiddle DEMO · share improve this ... https://stackoverflow.com Using a IF Statement within a TSQL UPDATE - Stack Overflow
You are looking for the CASE expression: Column2 = CASE WHEN @NewColumnValue IS NULL THEN 'False' ELSE 'True' END. https://stackoverflow.com Using IF..ELSE in UPDATE (SQL server 2005 andor ACCESS 2007 ...
this should work update table_name set column_b = case when column_a = 1 then 'Y' else null end, set column_c = case when column_a = 2 then 'Y' else null ... https://stackoverflow.com Using ifelse in insert and update statements - Stack Overflow
The (sort of) equivalent is to use CASE expressions: UPDATE main SET main.field1 = CASE WHEN staging.field1 IS NULL THEN -- WHEN staging.field2 IS ... https://stackoverflow.com |