In this section, we cover common string functions seen in SQL. Different RDBMS may employ different string functions, and there may also be differences in the syntax for each RDBMS even when the function call is the same. All such differences are explained in each section. Please note that we do not list all possible SQL string functions in this tutorial. Rather, the most commonly used ones are covered.

• SQL CONCATENATE
• SQL SUBSTRING
• SQL INSTR
• SQL TRIM
• SQL LENGTH
• SQL REPLACE
• SQL TO_DATE