Sql while loop select

Setup a private space for you and your coworkers to ask questions and share information. Description In SQL Server, you use a WHILE LOOP when you are not sure how many times you will execute the loop body and the loop body may not execute even once. If the condition is True then it will execute the statements inside the loop.

The execution of statements in the WHILE loop can be controlled from inside the loop with the BREAK and CONTINUE keywords. Transact- SQL -Syntaxkonventionen Transact- SQL Syntax Conventions. Enthält Beispiele zur Veranschaulichung dieser Methoden. WHILE statement sets a condition for the repeated execution of an SQL statement or statement block. The WHILE loop statement continues to execute the statements between the LOOP and END LOOP as long as the condition in the WHILE clause evaluates to TRUE.

WHILE LOOP Statement The WHILE LOOP statement runs one or more statements while a condition is TRUE. When I am looking for a forum post related to SQL Server, one of the junior professional is asking how to use a DO… WHILE loop is MS SQL Server. BREAK keyword will exit the stop the while loop and control is moved to the next statement after the while loop. CONTINUE keyword skips all the statement after its execution and control is sent to the first statement of while loop.

Run following examples in Query Editor and see the result. This is very easy to understand example for CONTINUE and BREAK keywords. But now I need to do some more SQL when new. So I hope with posting my php code, someone can tell me how to do this in SQL.

How to architect a WHILE loop using table variable? SQL Server Administration FAQ, best practices, interview questions. Both are used with multiple rows to give decisions on a row-by-row basis. If I can pass it the dates in an array, separated by commas, that would be awesome. A while loop will check the condition first and then executes the block of Sql Statements within it as long as the condition evaluates to true.

Avoid the use of the WHILE loop whenever is possible T- SQL was designed to work with sets of data. That is why is not usually a good idea to work with sequences and loops that usually iterate row by row. Also mit einer WHILE Schleife hatte ich schon angefangen, aber das Problem war, dass ich nicht wusste, wie ich das SELECT Statement in die WHILE -Schleife kriege.

Die Variante ist aber nicht sehr performant, denke ich, da er einfach nur alle Jahre abfragt. Loops in SQL Part two of a three-part series of blogs Many programming languages feature a variety of types of loop which allow your programs to repeat a set of instructions multiple times. The SQL statements are executed repeatedly as long as the specified condition is return TRUE.

Just to clarify that while loops do work. The while - loop -condition (an expression) is evaluated before each iteration of the loop. However, because select _statement is not an independent statement, the implicit cursor is internal—you cannot reference it with the name SQL. PostgreSQL provides you with three loop statements: LOOP , WHILE loop , and FOR loop.

Simple solution used to insert data into tables. I mean In cursors we fetch rows one by one how can I do that in a while loop that too using Dynamic SQL bcoz I have to access a different server. Variable PIVOTING with Self-Terminating WHILE Loop UPDATE By Kalman Toth, M. The WHILE loop in SQL is usually used to control access to a cursor, but they can be used in their own right as well.

This approach is useful if you want to avoid locking down a table while you traverse a set of records. If the expression is false when the program reaches the WHILE loop , the loop code is jumped and never executed. While loop with dynamic sql. Personally, I like the SELECT INTO, it seems clear and concise to me.

You can find the example given below of BOL, which is very useful. A T- SQL WHILE loop demonstration with BREAK and CONTINUE Just a short blog post to demonstrate the use of a WHILE loop in T- SQL , together with the BREAK and CONTINUE statements. A WHILE loop executes a statement block repeatedly until a specified condition is no longer true.

See also Iterating over collection variables. Description: The optional AS CURSOR clause creates a named cursor that can be referenced (after WHERE CURRENT OF) within the FOR SELECT loop in order to update or delete the current row. This feature was already added in InterBase, but not mentioned in the Language Reference. Repeats a statement or group of statements while a given condition is true.

It tests the condition before executing the loop body. Execute a sequence of statements multiple times and abbreviates the code that manages. I need a loop that will insert the following values for ? Can someone please help? Dein Code funktioniert einwandfrei und verglichen mit den Loops in Java ist er unglaublich schnell (sekunden).

Ich habe jetzt noch den Spezialfall eingebaut, dass nur ein Eintrag pro Clickstream existiert und ihm den Code verteilt.