If you are software developer soon or a later you’ll have to work with SQL and databases in general. Having SQL training will help you learn SQL concepts and SQL commands and will make your work a lot easier.
You have the choice to pay for SQL training course, which can be online or in person, you can buy a SQL training book, or you can simply find a good SQL training resource online and learn from there. No matter which option you choose for your SQL training, it’s better to start now.
When learning SQL, don’t just read a SQL book/website or listen to SQL presentation, but be active. By active I mean practice your new SQL knowledge, until you can do things without using a reference. This will make your SQL training much more productive.