Using a different type of FOR loop, you can iterate through the results of a query and manipulate that data accordingly. The syntax is: [ <<label>> ]FORtargetINqueryLOOPstatementsENDLOOP[label]; 3.5 Looping Through Arrays The FOREACH loop iterates through the elements of an array value. Th...
I would try standard cursor approach
The next method moves the cursor to the next row, and because it returns false when there are no more rows in the ResultSet object, it can be used in a while loop to iterate through the result set. A default ResultSet object is not updatable and has a cursor that moves forward only...
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方法1:使用LOOP,LOOP中使用EXIT直接退出,保证只执行一次: 1declarefound boolean :=false; 2forxin(SELECT*FROMtbl_some_tableWHEREsome_condition) loop 3found :=true; 4--Do something here; 5endloop; 6IFnotfoundTHEN 7--DO something else
SELECT UPDATE MERGE Transact-SQL 語法慣例 語法 <query_hint > ::= { { HASH | ORDER } GROUP | { CONCAT | HASH | MERGE } UNION | { LOOP | MERGE | HASH } JOIN | FAST number_rows | FORCE ORDER | MAXDOP number_of_processors | OPTIMIZE FOR ( @variable_name { UNKNOWN | = literal_...
The results of this query show the number of times the index has been used, sorted by Usage. XML 複製 -- Create required table structure only. -- Note: this SQL must be the same as in the Database loop given in the -- following step. SELECT TOP 1 [Usage]=(user_seeks+user_...
select dbo.RegexMatch( N'123-45-6789', N'^\d{3}-\d{2}-\d{4}$' ) The pattern in this statement is a simple test for a US Social Security Number. Set a breakpoint on the new query and then start debugging to step through the function. This function lets...
SELECT@total; 注: (1)变量是内存中一个特定的位置,用来临时存储数据,所有MySQL变量必须以@开始 (2)关键字OUT指出相应的参数用来从存储过程传出一个值;IN表示传递参数给存储过程;INOUT,对存储过程传入和传出。 智能存储过程 实现功能:获得订单合计,对合计增加营业税,返回合计 ...
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