Select in update mysql

This query selects a random employee from the table employees whose job title is the Sales Rep. If you query data from the employees table, you will see that every customer has a sales representative. In other words, the following query returns no row.

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Improve this question. Akina New contributor. Fortunately, there is another option that does not require using transactions, and can select and update the counter with a single access to the table:.

This statement selects the current value of the counter and increments it in a single statement:. You do not need to declare it. The sample code is similar for each database, but the data types are different. Our examples in this guide will show you how to update the person. This method is slightly different to the previous two.

The join is performed in the Update clause, and not in the From clause. The Select query inside the Update statement looks up the two tables and constructs the right data set to use. Then the Set clause will set the person account number to the account number value.

This will happen depending on the tables and query that you have. Creating primary keys on the table may still result in this error.