Mysql while loop select and insert. Mar 12, 2025 · ...
Mysql while loop select and insert. Mar 12, 2025 · This comprehensive guide covers the while loop in MySQL, explaining its syntax, use cases, and practical examples. END WHILE Actually, the WHILE loop checks the expression at the starting of every iteration. Clauses help you refine your data extraction. The statement list within a WHILE statement is repeated as long as the search_condition expression is true. When selecting from and inserting into the same table, MySQL creates an internal temporary table to hold the rows from the SELECT and then inserts those rows into the target table. . Learn how to use the SQL FOR loop to insert multiple rows of data into a table with this easy-to-follow guide. Within a stored function, RETURN can also be used, which exits the function In this article, we will look at examples of a SQL Server WHILE loop in T-SQL and discuss alternatives like a CTE and cursor. By leveraging constructs like LOOP, WHILE, and REPEAT, along with flow control statements such as IF, CASE, ITERATE, and LEAVE, developers can create complex stored procedures and functions that automate tasks and process data 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'loop1: LOOP INSERT INTO TempTable (id, name) SELECT id, name FROM table1' at line 1 LOOP implements a simple loop construct, enabling repeated execution of the statement list, which consists of one or more statements, each terminated by a semicolon (;) statement delimiter. If the expression evaluates to true, MySQL will execute statements between WHILE and END WHILE until the expression evaluates to false. The statements within the loop are repeated until the loop is terminated. Remember that you are answering the question for readers in the future, and those people might not know the reasons for your code suggestion. Similar to other programming languages MySQL provides support for the flow control statements such as IF, CASE, ITERATE, LEAVE LOOP, WHILE, and REPEAT. Here we discuss an introduction to MySQL WHILE LOOP with the working of loop and respective examples. Why would you do a loop if all you want bring over is only one value?? medina – medina 2013-05-28 23:50:25 +00:00 CommentedMay 28, 2013 at 23:50 1 Answer Sorted by: 2 I am beginner in MYSQL and I want to use while loop to get the data from the table using a select statement and joining another table via subquery. LOOP implements a simple loop construct, enabling repeated execution of the statement list, which consists of one or more statements, each terminated by a semicolon (;) statement delimiter. Whether you're updating records or performing calculations, this tutorial will enhance your MySQL skills and improve your database management efficiency. Start learning SQL now » [PHP] จะเอาค่า ที่แสดงแบบ while loop ไปแล้ว ไป insert แบบวน loop ยังไงหรอครับ I'm trying to move enums from a table into their own table, the easiest way would be to run an SQL query which I figured I might use a WHILE loop for, but having never used one before the below obv Based on the maximum and minimum parameters provided, the example will insert 10000 records into a table. WHERE Clause WITH Clause HAVING Clause ORDER By Clause Group By Clause LIMIT Clause Distinct Clause FETCH I am facing a very strange problem with while loop insert on MySQL Here's the background information of my test: CREATE TABLE test_table ( `token` varchar(16) NOT NULL, `val1` varchar(256) DEFA This comprehensive guide covers the while loop in MySQL, explaining its syntax, use cases, and practical examples. Run SELECT * FROM table2; and load it into an array in memory The outer for loop could still pass through table1 but the inner loop reads the data from table2 from the array. Instead, you typically use a WHILE loop with a stored procedure or a function. Now I want to insert every user ID into different table. Let's discuss it one by one. I'm trying to insert a bunch of records in my MySQL database table. In this tutorial, we will study the execution of the WHILE loop in MySQL. LOOP in the Stored Procedure We will see the first example of the LOOP statement in MySQL. They may return result sets in case you use SELECT statements; they can return multiple result-sets. The while() loop loops through the result set and outputs the data from the id, firstname and lastname columns. 1w次，点赞3次，收藏18次。本文介绍如何使用SQL语句创建一个学生信息表，并通过存储过程和函数的方式批量插入数据记录。涉及表结构定义、存储过程及函数的创建、调用与删除。 I'm trying to loop through the two test tables and get a count of each and insert into another table with the table names and counts. I'm trying to loop through the two test tables and get a count of each and insert into another table with the table names and counts. the stored procedure is created succesfully but when i execute it it says 0 rows affected. Let’s see the syntax of the LOOP statement first. MYSQL&PHP: running an INSERT INTO SELECT query within a PHP while loop, running slow Asked 11 years, 3 months ago Modified 11 years, 3 months ago Viewed 748 times I have a stored procedure that is looping through a result set from a select statement. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems. If any SQL statement exists outside the loop, it will be executed. The third step explains how to execute the stored procedure with a specific parameter value to insert the desired number of rows. with out the w In this tutorial, learn how to define stored procedures in MySQL and what they're good for, with examples The first_day function you need is: How to get first day of every corresponding month in mysql? Showing the Procedure is working Simply add the following line below END WHILE and above END SELECT @curmonth,@curmonthname,@totaldays,@daycount,@workdays,@checkweekday,@checkday; Then use the following code in the SQL Query Window. Can we use Select statement inside a loop in a Mysql Stored Procedure? why is the code wrong create procedure AbsentReportproc (INOUT fromdate DATETIME, INOUT todate DATETIME) as begin DECLARE Did you notice that we did not insert any number into the CustomerID field? The CustomerID column is an auto-increment field and will be generated automatically when a new record is inserted into the table. pass the stored procedure a book ID and a word and record the result. Learn how to automate repetitive tasks and streamline your data processing workflows with while loops. Here is my code: BEGIN DECLARE var INT; SET var = 0; WHILE var < 1000 The statement list within a WHILE statement is repeated as long as the search_condition expression is true. Hi everyone, sorry it's been a while! I had a bit of a breakthrough today, finally achieving (or at Tagged with mysql, loop. Within a stored function, RETURN can also be used, which exits the function How can we use while loops in MySQL? My test script: BEGIN SELECT 0 INTO @n; WHILE @n < 10 DO SELECT @n; SET @n := @n +1; END WHILE; END; But it has syntax errors. -- Drop table if existsDROP TABLE IF EXISTS TestTable;--… i have a stored procedure where i have a insert into select statement inside a while loop. You can also create functions in MYSQL. Is is like: set i=0; while i<25 do insert into a (x,y,z) select a,b,i I'm trying to check an email against my database, and if it doesn't already exist, add it to the database. This MySQL tutorial explains how to use the WHILE statement (WHILE LOOP) in MySQL with syntax and examples. When one of those insert statement Learn how to insert data into a table in SQL using a while loop. The following example shows the same as the example above, in the MySQLi procedural way: I have a query which lists users IDs based on some criteria. statement_list consists of one or more SQL statements, each terminated by a semicolon (;) statement delimiter. This guide explores how to use loops in MySQL, specifically utilizing the procedural language that comes with MySQL’s support for stored routines. Usually, this is accomplished with a LEAVE statement. $query = "SELECT * FROM users"; $inputQuery = "INSERT INTO LOOP implements a simple loop construct, enabling repeated execution of the statement list, which consists of one or more statements, each terminated by a semicolon (;) statement delimiter. And need to insert records depending on the qty. Learn how to use the MySQL REPEAT loop statement to execute one or more statements until a condition becomes true. Inside of the loop there is a if statement that has two insert statements. In the LOOP statement, you don’t need to specify the condition when you define it as we do in the WHILE loop. Does not make sense your logic at WHILE id > 1 DO. While loop is used to execute one or more than one statement till the condition holds true. The WHILE loop checks the expression before the statements execute, that is why it is also called the pretest loop. Example 1. Learn how to efficiently use MySQL WHILE LOOP to automate database tasks. @Simon Goater - In MySQL there is no direct WHILE loop syntax like in other programming languages. Please help me guide to construct my code, Below However, you cannot insert into a table and select from the same table in a subquery. SQL WHILE loop syntax and example The syntax of the WHILE loop in SQL looks like as follows: After these explanations, we will give a very simple example of a WHILE loop in SQL. Is it possible to call a while statement inside a SELECT clause in MySQL ? Here is a example of what I want to do : CREATE TABLE `item` ( `id` int, `parentId` int, PRIMARY KEY (`id`), UNI My question: is there a way I can do some kind of "for each" loop on the Words table using my stored procedure? ie. Otherwise, the code flow will exit the loop. However, you cannot insert into a table and select from the same table in a subquery. Summary: in this tutorial, you will learn how to use the MySQL WHILE loop statement to execute one or more statements repeatedly as long as a condition is true. In MySQL, I have this stored procedure with a LOOP: DELIMITER $$ CREATE PROCEDURE ABC() BEGIN DECLARE a INT Default 0 ; simple_loop: LOOP SET a=a+1; select a; Conclusion Loops in MySQL facilitate repetitive task execution, enhancing the efficiency of database operations. Jan 29, 2024 · In databases like MySQL, loops can aid in automating repetitive tasks for data management and manipulation. Vanity URL while Loop with PDO Select and Insert not working properly Asked 13 years, 5 months ago Modified 13 years, 5 months ago Viewed 184 times 師匠「おう、来たな弟子よ。今日はMySQLの奥義、テーブルの全行を巡る『巡回神功』を伝授してやろう。世の中には『for each record』などという紛い物もあるようだが、MySQLにはMySQLの流儀がある。心して聞くが良い！」弟子「はい、師匠！よろしくお願いいたします！」 Based on the maximum and minimum parameters provided, the example will insert 10000 records into a table. SELECT Statement INSERT INTO INSERT Multiple Rows UPDATE Statement DELETE Statement DELETE Duplicate Rows SQL Clauses Unlock powerful ways to filter, organize, and group your query results. These procedures contain IN and OUT parameters, or both. Would you like to do this in a stored procedure? I want to use the loop index "i" in the result of my select statement in order to insert it into another table. You can read our detailed guides on these MySQL loops here. Includes syntax, examples, and best practices. I was thinking of a loop which would go through the list and insert a row one b 文章浏览阅读2. Jul 15, 2025 · In this, we will cover the overview of MySQL WHILE Loop and then will cover the algorithm of each example and then will see the analysis of each example. On all the info I could find on dynamic sql it looks like I have to use CONCAT as opposed to putting the variables directly into the sql statement. In this tutorial, you will learn how to use MySQL LOOP statement to run a block of code repeatedly based on a condition. This tutorial covers the syntax and provides examples of how to use a while loop to insert data into a table. While this code snippet may solve the question, including an explanation really helps to improve the quality of your post. With step-by-step instructions and examples, you'll be an SQL FOR loop insert expert in no time! The procedure uses a WHILE loop to insert rows with incremental values. I am not expert to create a stored procedure. The goal of this example is to show beginners how to -1) construct a WHILE loop statement2) Develop a stored procedure3) Insert 10,000 random records for the practice dataset. Guide to MySQL WHILE LOOP. -- Drop table if existsDROP TABLE IF EXISTS TestTable;--… The statement list within a WHILE statement is repeated as long as the search_condition expression is true. In MySQL, the WHILE statement is used when you are not sure how many times you will execute the loop body and the loop body may not execute even once. eg:- If a qty=2, It needs to execute the insert query twice (Should be inserted 2 same records with auto increment clcodes). qdgymg, jagq3, orz3w, bwlbdu, 2ra3, hdpi, 6soo, 0l9la, ggqt, fmxxp,