Identifiers
Identifiers are names given to SQL entities, such as tables, columns, databases, and variables. Identifiers must be unique so that entities can be correctly identified during the execution of a program. Identifiers can also be used to change a column name in the result (column alias) in a SELECT statement. Identifiers can be either quoted or unquoted and a maximum 128 characters long.
Identifiers are sometimes referred to as “names”.
Regular identifiers must follow these rules:
Must not contain any special characters except for underscores (
_).Must be case-insensitive. SQream converts all identifiers to lowercase unless quoted.
Does not equal any keywords, such as
SELECT,OR, orAND, etc.
To bypass the rules above you can surround an identifier with double quotes (") or square brackets ([]).
Quoted identifiers must follow these rules:
Must be surrounded with double quotes (
") or square brackets ([]).May contain any ASCII character except
@,$or".Must be case-sensitive and referenced with double quotes or square brackets (
[]).
Identifiers are different than keywords, which are predefined words reserved with specific meanings in a statement. Some examples of keywords are SELECT, CREATE, and WHERE. Note that keywords cannot be used as identifiers.
The following table shows a full list of the reserved keywords:
Keywords |
||||
A - C |
C - G |
H - N |
N - S |
S - W |
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