SQL queries. Why is string data enclosed in quotes?

Question

MySQL

Why is string data enclosed in quotes?

Answer 1

To make it clear where the line starts and where it ends. Compare:

SELECT * FROM table WHERE field1 = value1 OR field2 = value2;
SELECT * FROM table WHERE field1 = 'value1 OR field2 = value2';

Answer 2

Not to fulfill, but to keep. If you want to save the request code, then how to distinguish what needs to be saved and what needs to be executed?

INSERT INTO `table` ... `text` = Привет SELECT * FROM admins limit 1

?

INSERT INTO `table` ... `text` = "Привет SELECT * FROM admins limit 1"

+
And how to distinguish the name of your field from the function?
SELECT COUNT(COUNT)?
SELECT COUNT(`count`)+