What I like to do is to select two columns from a table based on a where condition, then do a loop through the result-set (or while I am selecting the record) and pass the two variables for each observation as a parameter into a macro. 4. If two or more WHILE loops are nested, the inner BREAK exits to the next outermost loop. SQL Server While loop starts with the condition, and if the condition result is True, then statements inside the BEGIN..END block will execute. 1. First, I need three package level variables. This will allow me to use a WHILE LOOP activity in a process flow because I can determine: how many distinct sets to work through, and which set we should use on each iteration. Causes the WHILE loop to restart, ignoring any statements after the CONTINUE keyword. If you can uniquely identify every row of a table that you must iterate, you can use a WHILE loop rather than a cursor, and potentially gain better performance. Science, MCDBA, MCITP. The SQL While Loop is used to repeat a block of statements for a given number of times until the given condition is False. The total count is now 4. USE AdventureWorks2017; GO SELECT QUOTENAME(SCHEMA_NAME(Tbl.schema_id)) + '.' vLoopSet is the System.Object that will store the ADO dataset. Before going into discussion of while loop, we will discuss about temporary table in SQL. Additional SQL Server Cursor Examples. In this post we will see three ways to iterate through table rows in a loop using T-SQL. October 7, 2007. Check out these other tips that leverage cursor-based logic: Variable PIVOTING with Self-Terminating WHILE Loop UPDATE By Kalman Toth, M.Phil. ... through, it gets assigned the value of 1. Any ideas/help on getting the code more efficient … Row counts for each tables using sys.partitions. delimiter // CREATE PROCEDURE yourProcedureName() BEGIN DECLARE anyVariableName1 INT DEFAULT 0; DECLARE anyVariableName2 INT DEFAULT 0; SELECT COUNT(*) FROM yourTableName1 INTO anyVariableName1; SET anyVariableName2 =0; WHILE anyVariableName2 < … Actually, we use temporary table for using while loop. Seems like a simple construct that would be used often. A Design Pattern (Loop through rows with multiple columns) with Recordset Destination and Foreach Loop Container . To loop through a query output table use a cursor. Code language: SQL (Structured Query Language) (sql) In this example, the SELECT statement of the cursor retrieves data from the products table. How to loop through table using while loop and create another table with values needed Tags: datetime , recursive-query , sql , sql-server , tsql I have two tables: MainTable and MyTable . Do while loop to check each record in a MySQL Table, see code But i want certainly not just want not use recordset or MySqlDataReader. Comp. The loop was very helpful to execute the table row by row. It is executed on row-by-row basis. SQL> create table source.sales_stg as select * from sh.sales; Table created. My challenge to you is to try to utilize the same logic and to create a similar ‘routine’ using a cursor as I have utilized in many of my previous articles on SQL Shack. Here is the Control Flow I will need. SQL Server 2005 has introduced the PIVOT function which can be used to flip rows into columns in a fixed layout format. Iterating through the rows of data returned from SQL Server Using column values from the SQL server result set to create – and uniquely name – text … I want to perform UPDATE row-by-row. Physics, M.Phil. Remarks. my requirement is to get all the rows in the table one by one and get corresponding exchange value from an API and insert into another table. I am using Microsoft SQL SERVER 2008 R2. sys.partitions is a SQL Server System Catalog view which contains a row for each partition of all the tables and most types of indexes in the database. 2. I'm new to Powershell and wondered if I needed to break out the code to loop through the datatable first and make the update to the datatable and THEN insert the datatable into the SQL Server table? 3. As of now I am using a less efficient way by adding an Id column and then updating the row number. Hi, it does not step through the temp table's data, it repeats the first row for the number of rows in the import file (99 rows, 99 repetitions with same data - … That leaves the decided minority where operation on one row is a must; in those cases, I use a WHILE loop. To loop through all rows of a table, use stored procedure in MySQL. I am now using vb.net asp.net. Just as a curiosity (since the question states T-SQL) it is also possible to solve this problem efficiently using SQLCLR. Notice that it is necessary to perform a query on the base table for each record returned. I am new to sql server and i had been doing this with ado.net and vb6 earlier. In the example above, backups are issued via a cursor. In SQL Server, we use a WHILE LOOP when we are not sure how many times the loop body will be executed. All the statements after the end of the inner loop run first, and then the next outermost loop restarts. 1. 5. proc sql runs against sashelp.cars I have a function that takes in a table name, and I want to loop through the 2 fields in the table, and create a string that has a comma between the 2 fields for a line and a new line for each row. This then causes a subsequent SQL to fail since it’s trying to use the bad data. A TABLE variable is used to store the query results and a simple WHILE LOOP is used to iterate the rows of the resultset. The source code is: Access VBA loop through all Tables using DAO.TableDef Suppose we have an Acess Table or Query and you want to loop through the records (in Excel terms, to loop the values in each row), we have to make use of Recordset objects, which has different Methods … This is what enables you to avoid the use of a SQL Server CURSOR.-- Create a table variable to store user data. I Is that possible? %scan pulls out the 1st value (i=1 here), and assigns the value to &table, which is cars. The syntax is as follows −. I'm not talking about a persisted IDENTITY column (or the new SEQUENCE in SQL Server 2012), but rather a transient set to be used only for the lifetime of a query. The other two non-System.Object variables are for each column in the ADO recordset. 2. Each of the values would go through some calculations before being added to the string. SQL loops through the current row in the table data and a value in the previous row +/- ... it is simpler to use the cursor to loop through the data in the table #temptable and then add the argument1 from the current row and the previous row to the argument2 of the current row. Using this you can get a row counts for each tables in database. The FOR LOOP statement opened, fetched each row in the result set, displayed the product information, and closed the cursor.. B) Cursor FOR LOOP with a SELECT statement example. Example of a Basic While Loop to Cycle through Table Rows in SQL Server; The code samples in this tip are valuable to illustrate the differences between cursors in SQL Server and the While Loop. Examples A. call/fetch and a while loop. Check its closing balance (which will then become the opening balance of the next row) and then loop through the subsequent rows updating their closing balance with the formula closing_balalnce = opening_balance + receipts - issues . The following snippet performs the same operation as the cursor above but through the use of a WHILE loop. PROC SQL noprint; CREATE TABLE WORK.MyTableResult AS SELECT t1.CODE, t1.CODE_Name FROM MyLIB.CODETABLE t1 Macro is compiled then called. &to_loop_count is set to 3. You can see the results table is messed up. I want to Loop through each row in a table, set variables to the values of each row in order to do some repetitive processing. I have a temporary table in SQL Server 2008. There are many use cases for generating a sequence of values in SQL Server. DECLARE @myTable TABLE (UserID INT IDENTITY(1,1), UserName VARCHAR(50), Password VARCHAR(50), Email VARCHAR(50))-- Insert some data to table to work … Let me walk you through an example to show you why. I have a counter variable that increments by 1 at the bottom of the loop and gets the next row … The third row does not exist, because we have deleted it so now the table is showing only 4 records. Comparing Iteration Strategies Second, Transact-SQL cursors are just one way to iterate through a table row by row. The example below will read each row of an eventsTable reading the EventID,StartDate and EndDate into 3 variables Declare your cursor for the table and the variables to hold your values List of tables to process defined in &tables_to_process with spaces between tables to loop over. I usually have my rows inserted into a temp table with an identity column (int,1,1) called rowid. The idea is to read rows one at a time in turn order until the weight exceeds 1000 (or we run out of rows), then to return the last name read.. We have worked with the “Row_Number” function and through the usage of a while loop, we have been able to reach our end goal. Create a new table (say Items) in database, with the following script. Let first setup a target table we want to iterate rows. 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