Mysql Update If //

It seems I have big problems with conditional queries. I have to do a conditional update. I write here what I would like to do: IFSELECT tipo FROM abbonamento WHERE idU = 17 = 'punti' THEN UDPATE abbonamento SET punti = punti - 1 ELSE UPDATE abbonamento SET bonus = bonus - 1. Summary: updating data is one of the most important tasks when you work with the database. In this tutorial, you will learn how to use the MySQL UPDATE statement to update data in a table. Displaying customize text instead of NULL using MySQL IF function. In the book_mast table, the publishing language of some book have not been set, therefore when we select book_mast, the pub_lang column displays NULL values, which is not meaningful for the reporting purpose. See the following query. This MySQL UPDATE statement example would update the state to 'California' and the customer_rep to 32 where the customer_id is greater than 100. Example - Update table with data from another table. Let's look at an UPDATE example that shows how to update a table with data from another table in MySQL. 16/10/2010 · MYSQL - How to use UPDATE with IF-ELSE condition. MySQL Database Forums on Bytes.

25/11/2016 · 一条mysql update if then 语句. 阅读数 13391. PHP 不同地图坐标系经纬度转换 GCj02 WGS84 BD-09. 阅读数 2720. 高性能数据库连接池的内幕. 阅读数 1823 (插件设计与简单应用)php中钩子hook的应用示例demo. 阅读数 1316. MySQL Database MySQL Database MySQL Connect MySQL Create DB MySQL Create Table MySQL Insert Data MySQL Get Last ID MySQL Insert Multiple MySQL Prepared MySQL Select Data MySQL Where MySQL Order By MySQL Delete Data MySQL Update Data MySQL Limit Data PHP XML PHP XML Parsers PHP SimpleXML Parser PHP SimpleXML - Get PHP XML Expat PHP XML DOM PHP. UPDATE Query if a want to update a record only if the supplied data is different? That is already the way UPDATE works! UPDATE typically uses a WHERE clause. Many rows may match the WHERE clause, but only the rows that require changes will be updated. The rest will be left untouched. MySQL Functions. String Functions. Notice the WHERE clause in the UPDATE statement. The WHERE clause specifies which records that should be updated. If you omit the WHERE clause, all records in the table will be updated!. Update the City column of all records in the Customers table. UPDATE Statement. Transactional and Locking Statements. START TRANSACTION, COMMIT, and ROLLBACK Statements. Statements That Cannot Be Rolled Back. Statements That Cause an Implicit Commit. SAVEPOINT, ROLLBACK TO SAVEPOINT, and RELEASE SAVEPOINT Statements. MySQL 5.7 Reference Manual /.

Try It Out. Displaying N/A instead of NULL using MySQL IF function. Let’s take a look at the data in the customers table in the sample database. In the customers table, many customers do not have state data in the state column therefore when we select customers, the state column displays NULL values, which is not meaningful for the reporting.

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