Question: How can I loop through each row in the Details table and check whether the IsPaid field is already true? if all rows were true, how can I update the IsPaid field of the Header table? Thank you all for your helpReply Answers...
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...
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 ...
Adding a column to a large (100 million rows) table with default constraint adding a extra column in a pivot table created uisng T-SQL Pivot Table query Adding a partition scheme to an existing table. Adding a Value to a 'date' Column caused an overflow?? Adding Column to existing table...
--CREATE a table to store the results CREATE TABLE IF NOT EXISTS ordertotals (order_num INT, total DECIMAL(8,2)); --Open the cursor OPEN ordernumbers; --Loop through all rows REPEAT --GET order number FETCH ordernumbers INTO o; --Get the total for this order CALL ordertotal(o,1,...
In another part of my App I then query the same table to loop through those records, to compare them against other records in the DB. However, it always skips past the "while (reader.Read())" loop, returning false on HasRows, even though I know the table has records (which is ...
So... how can I refer to a variable from within this SQL Statement to get the current data I need out of the table, as I loop through? I'm hoping you know the answer to this! stevefromOZ SSC-Forever Points: 43646 More actions ...
全表扫描(Table Scan):逐行扫描整个表 索引扫描(Index Scan):通过索引定位数据 嵌套循环(Nested Loop):逐行匹配两个数据集 哈希连接(Hash Join):使用哈希表实现数据集连接 排序(Sort):对结果集进行排序操作 1.3 成本估算模型 数据库优化器基于以下因素估算执行成本: ...
is_open (infile) THEN -- loop through each line in the file LOOP BEGIN UTL_FILE.get_line (infile, vnewline); -->从源文件读取行 i := UTL_FILE.fgetpos (infile); -->将行的位置赋值并输出 DBMS_OUTPUT.put_line (TO_CHAR (i)); UTL_FILE.put_line (outfile, vnewline, FALSE); --...
If the table has 10 rows, the loop repeats 10 times. To update the properties of the Execute Process task, you map variables to item columns by using the index of the column. The first column defined in the enumerator item has the index value 0, the second column 1, and so on. The...