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SQL Strings

A string, in SQL, is delimited by an apostroph ('). So, in order to insert a String into a table, the following syntax is used:
insert into some_table values ('hello');
However, how would someone insert hello I'm here? Obviously, the following would be wrong:
insert into some_table values ('hello I'm here');
In order to have an apostroph within a string, two apostrophs are needed:
insert into some_table values ('hello I''m here');