MySQL

Assuming there are tables EMP and EMP2, which have the same schema, and there are possible duplicate IDs present in them???the following query will help us identify the unique records:

There are times in which we need to suppress some errors that are not impacting what we currently are working on. In MySQL, we may want to suppress an error

There are numerous cases in which you get null and are not able to handle it effectively in the code. MySQL has a command that can help you know if

There are many ways for a DBA to increase performance and you may want to use some of them in your code. For example, you may want to list all

The following commands are handy to know the current version and the supported engines in the MySQL. Command: SELECT VERSION()Output: 5.6.31-enterprise-commercial-advanced-logCommand: SHOW ENGINESOutput: InnoDBCSVMyISAMBLACKHOLEMEMORYFEDERATEDARCHIVEMRG_MYISAMPERFORMANCE_SCHEMA

All data modifications of MySQL are updated onto logs in binary format. At times, if maintenance such as backup is not in place, and the data storage reaches the maximum

The null value often needs special attention in your code to work effectively. For developers, it is important to know if the value that was received for a query is

There are many times when you are running on low memory and want to limit the data in your transactions. Especially, when you are sure that you don’t need all

Assuming you have a column in a table of type DATETIME, and you want to filter it based on dates and time as well, BETWEEN will be helpful. Listing 1.