Literals

A string literal is enclosed in single quotes. To represent a single quote within a literal, use two single quotes; for example, 'literal''s'. String literals use the Unicode character encoding. String literals are case sensitive.

An exact numeric literal is a numeric value without a decimal point, such as 57, -957, and +62; numbers in the range of long are supported.

An approximate numeric literal is a numeric value with a decimal point (such as 7., -95.7, and +6.2), or a numeric value in scientific notation (such as 7E3 and -57.9E2); numbers in the range of double are supported. Approximate literals use the floating-point literal syntax of the Java programming language.

The boolean literals are TRUE and FALSE (case insensitive).

Internal computations of expression values use a 3-value boolean logic similar to SQL. However, the final value of an expression is always either TRUE or FALSE—never UNKNOWN.