Mysql while loop select and insert. Similar to other prog...

Mysql while loop select and insert. Similar to other programming languages MySQL provides support for the flow control statements such as IF, CASE, ITERATE, LEAVE LOOP, WHILE, and REPEAT. @Simon Goater - In MySQL there is no direct WHILE loop syntax like in other programming languages. You can read our detailed guides on these MySQL loops here. 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. 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. END WHILE Actually, the WHILE loop checks the expression at the starting of every iteration. the stored procedure is created succesfully but when i execute it it says 0 rows affected. 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. 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. When one of those insert statement Learn how to insert data into a table in SQL using a while loop. -- 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. The while() loop loops through the result set and outputs the data from the id, firstname and lastname columns. I'm trying to insert a bunch of records in my MySQL database table. 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. 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. Otherwise, the code flow will exit the loop. 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. Includes syntax, examples, and best practices. Whether you're updating records or performing calculations, this tutorial will enhance your MySQL skills and improve your database management efficiency. Learn how to efficiently use MySQL WHILE LOOP to automate database tasks. 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. This guide explores how to use loops in MySQL, specifically utilizing the procedural language that comes with MySQL’s support for stored routines. 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. In the LOOP statement, you don’t need to specify the condition when you define it as we do in the WHILE loop. Jan 29, 2024 · In databases like MySQL, loops can aid in automating repetitive tasks for data management and manipulation. LOOP in the Stored Procedure We will see the first example of the LOOP statement in MySQL. Let's discuss it one by one. While this code snippet may solve the question, including an explanation really helps to improve the quality of your post. Now I want to insert every user ID into different table. 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. 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. These procedures contain IN and OUT parameters, or both. statement_list consists of one or more SQL statements, each terminated by a semicolon (;) statement delimiter. 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. In this tutorial, we will study the execution of the WHILE loop in MySQL. Example 1. 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. 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. However, you cannot insert into a table and select from the same table in a subquery. . The statements within the loop are repeated until the loop is terminated. This tutorial covers the syntax and provides examples of how to use a while loop to insert data into a table. Inside of the loop there is a if statement that has two insert statements. pass the stored procedure a book ID and a word and record the result. They may return result sets in case you use SELECT statements; they can return multiple result-sets. 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. Mar 12, 2025 · This comprehensive guide covers the while loop in MySQL, explaining its syntax, use cases, and practical examples. Learn how to automate repetitive tasks and streamline your data processing workflows with while loops. Learn how to use the MySQL REPEAT loop statement to execute one or more statements until a condition becomes true. This MySQL tutorial explains how to use the WHILE statement (WHILE LOOP) in MySQL with syntax and examples. Instead, you typically use a WHILE loop with a stored procedure or a function. 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. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems. The third step explains how to execute the stored procedure with a specific parameter value to insert the desired number of rows. 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. While loop is used to execute one or more than one statement till the condition holds true. Guide to MySQL WHILE LOOP. Hi everyone, sorry it's been a while! I had a bit of a breakthrough today, finally achieving (or at Tagged with mysql, loop. 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. Let’s see the syntax of the LOOP statement first. 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. 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. You can also create functions in MYSQL. And need to insert records depending on the qty. If any SQL statement exists outside the loop, it will be executed. 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. 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. 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. The WHILE loop checks the expression before the statements execute, that is why it is also called the pretest loop. Learn how to use the SQL FOR loop to insert multiple rows of data into a table with this easy-to-follow guide. In this tutorial, you will learn how to use MySQL LOOP statement to run a block of code repeatedly based on a condition. 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. Remember that you are answering the question for readers in the future, and those people might not know the reasons for your code suggestion. Here we discuss an introduction to MySQL WHILE LOOP with the working of loop and respective examples. 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. 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. Clauses help you refine your data extraction. 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. 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. -- 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. $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. 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. The statement list within a WHILE statement is repeated as long as the search_condition expression is true. Does not make sense your logic at WHILE id > 1 DO. I am not expert to create a stored procedure. If the expression evaluates to true, MySQL will execute statements between WHILE and END WHILE until the expression evaluates to false. eg:- If a qty=2, It needs to execute the insert query twice (Should be inserted 2 same records with auto increment clcodes). Usually, this is accomplished with a LEAVE statement. 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. 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. da4ijz, lvlcs, coqofi, kurl, mdju, stp8t7, w8gby, oid3g, nnlo, gijl8j,