While SQL While loop is quicker than a cursor, reason found that cursor is defined by DECLARE CURSOR. Every emphasis of the loop will be executed inside system memory and consuming required server assets. On the off chance that the iteration count is extremely high, a...
在Case函数中,可以使用BETWEEN,LIKE,IS NULL,IN,EXISTS等等,通过在Case函数中嵌套Case函数,在合计函数中使用Case函数等方法,也可以在Check、触发器等中使用Case。 2、循环分支For和While 2.1For循环 for 变量 in 开始数值...结束数值 loop end loop; 1. 2.2While循环 只要表达式成立就执行循环语句 **while** 条...
Again, it really depends on your situation. I almost always use a cursor to loop through records...
The time taken by the fast forward cursor to complete the operation is 8 seconds. Converting Cursor to While Loop Now, let us convert the above example toWHILE loop. To convert a cursor to while loop, first you have to find the total number of rows in the table. Then you have to ite...
FETCH statements– Assign the specific values from the cursor to the variables to match the DECLARE CURSOR FOR and SELECT statement. NOTE – This logic is used for the initial population before the WHILE statement and then again during each loop in the process as a portion of the WHILE statem...
END LOOP; IF NOT v_cursor%ISCLOSE THEN CLOSE v_cursor; END IF; 8、FOR游标循环: 游标的for循环可以隐式地 open,fetch,close 游标以及循环处理结果集。 FOR i IN v_cursor LOOP XXX; END LOOP; 9、带参数的游标: CURSOR cursor_name(param type DEFAULT default_val) IS SELECT ---; ...
In this article, we will explore how to use SQL Server scroll cursors to selectively pick a row from the cursor instead of looping through rows one by one. Solution ASQL Server cursoris T-SQL logic to loop through a finite number of rows which are determined by the query that is used ...
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SQL%ISOPEN 布尔型 DML执行过程中为真,结束后为假 【训练1】 使用隐式游标的属性,判断对雇员工资的修改是否成功。 步骤1:输入和运行以下程序: SET SERVEROUTPUTON BEGIN UPDATE empSET sal=sal+100WHERE empno=1234; IF SQL%FOUNDTHEN DBMS_OUTPUT.PUT_LINE('成功修改雇员工资!'); ...
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