Are SQL data types dependent on the Relational Database Management Systems

Question

Do SQL data types differ based on the Relational Database Management Systems we use?

For example, if I choose MySQL will the database schema I will write for a table in MySQL will also be applicable if I choose to switch to DB2 in future?

Answer 1

Yes, data types do differ from system to system.

You can verify this easily by looking up the data types list for each RDBMS (they all have one, usually online). As a simple example, SQLite doesn't have a genuine DATETIME type; it stores dates using TEXT, REAL or INTEGER.

Further Reading
Oracle Data Types
SQL Server Data Types
Postgresql Data Types
SQLite Data Types