Certification

I would love to share few books name:-
SQL Practice Problems: 57 beginning, intermediate, and advanced challenges for you to solve using a 'learn-by-doing' approach:- The ability to work with data and write SQL is currently one of the most in-demand job skills.
T-Sql Querying:- Squeeze maximum performance and efficiency from every T-SQL query you write or tune. Four leading experts take an in-depth look at T-SQLs internal architecture and offer advanced practical techniques for optimizing response time and resource usage.
MYSQL: THE COMPLETE REFERENCE:- Get comprehensive coverage of all the powerful new features of MySQL, one of the fastest-and free-relational databases in use today.
Oracle Database 12C Hands-on SQL and PL/SQL:- The book teaches the basics of the Oracle database from a beginners perspective to the advanced concepts using a hands-on approach. Each and every concept has been elaborated with suitable practical examples along with code for clear and precise understanding of the topic.