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 iterate through the table rows using WHILE control-of-flow element till the total row ...
where t1.modelname='''||moTypeName||'''and t1.modelid=t2.modelid';executeimmediate v_sqlintov_count_number;if(v_count_number<>0)then--存在实体表,查询实体表名v_sql :='select t2.tablename from pm4h_mo.mdl_resmodel t1, pm4h_mo.mdl_resmodeltable t2 where t1.modelname='''||mo...
All access to cursors in PL/pgSQL goes through cursor variables, which are always of the special data type refcursor. One way to create a cursor variable is just to declare it as a variable of type refcursor. Another way is to use the cursor declaration syntax, which in general is: name...
The statements of code to execute each pass through the CURSOR FOR LOOP.Example Here is an example of a function that uses a CURSOR FOR LOOP: CREATE OR REPLACE Function TotalIncome ( name_in IN varchar2 ) RETURN varchar2 IS total_val number(6); cursor c1 is SELECT monthly_income FROM ...
Can we generate pipe delimited column through SQL query Can we optimise While Loop in sql server for large number of data? Can we pass parameters to the trigger?(Beginner) Can we RAISERROR inside MERGE Statement Can we select Bottom 1000 rows of a database Table from SSMS 2008 R2? Can ...
The WHILE loop, according toSQL Server Loop through Table Rows without Cursorarticle, states that a WHILE is faster than a cursor and uses less locks and use less TEMPDB resources. However, WHILE loops are still slow and have a performance impact. If it is a nested loop, it will be even...
*/ EXEC SQL DECLARE c1 CURSOR FOR SELECT personid, name, email FROM person.person where personid\<15; EXEC SQL OPEN c1; num_ret = 0; /* Array fetch loop - ends when NOT FOUND becomes true. */ EXEC SQL WHENEVER NOT FOUND DO break; for (;;) { EXEC SQL FETCH c1 INTO :person_...
Table Update是一个物理运算符。 Table-valued FunctionTable-valued Function运算符计算表值函数(Transact-SQL 或 CLR)并将结果行存储在tempdb数据库中。 当父迭代器请求这些行时,Table-valued Function将返回tempdb中的行。 调用表值函数的查询生成具有Table-valued Function迭代器的查询计划。 可以使用不同的参数值计...
ASQL Server cursoris T-SQL logic to loop through a finite number of rows which are determined by the query that is used to load the cursor. Cursors are mainly used to perform sequential operations on the rows. The cursor can be viewed as a data set or a list of data which can be ...
(),NULL,NULL,NULL,'LIMITED')WHEREavg_fragmentation_in_percent >10.0ANDindex_id >0;-- Declare the cursor for the list of partitions to be processed.DECLAREpartitionsCURSORFORSELECT*FROM#work_to_do;-- Open the cursor.OPEN partitions;-- Loop through the partitions....