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1 lut 2010 · Here's a query to update a table based on a comparison of another table. If record is not found in tableB, it will update the "active" value to "n". If it's found, will set the value to NULL. UPDATE tableA LEFT JOIN tableB ON tableA.id = tableB.id SET active = IF(tableB.id IS NULL, 'n', NULL)"; Hope this helps someone else.
How to connect to a MySQL database from Excel, fetch the latest data from it, and work with that data inside your spreadsheets in Excel. This tutorial is step-by-step and shows you how to do everything, from downloading the ODBC drivers (explained in the tutorial) to importing and transforming the data from specific tables in MySQL.
12 cze 2024 · The UPDATE statement in MySQL is essential for modifying existing data in a table. It's commonly used to correct errors, update values, and make other necessary changes. This article explores the structure and use cases of the UPDATE statement, with clear and concise real-life examples.
26 lut 2014 · Here’s a snippet of SQL code and a procedure for updating a MySQL database table using a subquery and data from Microsoft Excel (or similar).
21 sie 2024 · Definition. The IF-THEN statement is used to execute a set of SQL statements based upon a pre-defined condition. When the condition checks to be TRUE, the statements between IF-THEN and ELSE execute. On the other hand, the statements (else-statements) between the ELSE and END IF execute.
Summary. Use IF...THEN statement to conditionally execute a block of statements based on the evaluation of a specified condition. Use IF...THEN...ELSE statement to execute a block of statements if a specified condition is true and an alternative block of statements if the condition is false.
MySQL UPDATE examples. Let’s practice the UPDATE statement. 1) Using MySQL UPDATE to modify values in a single column example. See the following employees table from the sample database. In this example, we will update the email of Mary Patterson to the new email mary.patterso@classicmodelcars.com.
