Strings
A string literal is enclosed in single quotes—for example: 'literal'. A string literal that includes a single quote is represented by two single quotes—for example: 'literal''s'.

FROM User WHERE User.name = 'Vincent'

Integers
Integer literals support the use of PHP integer literal syntax.

FROM User WHERE User.id = 4

Floats
Float literals support the use of PHP float literal syntax.

FROM Account WHERE Account.amount = 432.123

Booleans
The boolean literals are true and false.

FROM User WHERE User.admin = true

FROM Session WHERE Session.is_authed = false

Enums
The enumerated values work in the same way as string literals.

FROM User WHERE User.type = 'admin'

Predefined reserved literals are case insensitive, although its a good standard to write them in uppercase.