A word, such as the name of a CQL statement (for example, SELECT or UNION) that must be specified in order to use a function is called a keyword.

For details about the meanings of keywords, see 4. CQL Reference.

The following figure shows examples of specifying keywords.

Figure 3-1 Keyword specification examples

Since most keywords are defined as system reserved words, they must be specified in their predetermined positions.

A CQL keyword that is not defined as a reserved word, however, can also be used as a name. In this case, the names are not case-sensitive.

The following table shows the character strings defined as system reserved words, in alphabetic order grouped by their leading character.

Table 3-3 Character strings defined as system reserved words

Leading character	Reserved words
A	ALL, AND, ANY, AS, ASC, AST, AVG
B	BETWEEN, BIGINT, BINARY, BOOLEAN, BY
C	CASE, CHAR, CHARACTER, CON, COUNT
D	DATE, DAY, DEC, DECIMAL, DEFAULT, DELETABLE, DELETE, DESC, DISTINCT, DOUBLE, DSTREAM
E	ELSE, END, EOF, EQ, EXISTS
F	FALSE, FLOAT, FROM
G	GE, GT, GROUP
H	HAVING, HOUR
I	IDSTREAM, IN, INSERT, INSTANT, INT, INTEGER, IS, ISTREAM
J	No reserved words
K	No reserved words
L	LATEST, LE, LIKE, LIMIT, LLP, LP, LRP, LT
M	MAX, MILLISECOND, MIN, MINUTE, MIS
N	NE, NOT, NOW, NULL, NUMERIC
O	OR, ORDER, OTHER
P	P_INT, PARTITION, PLS, POM, PR, PREV
Q	No reserved words.
R	RANGE, RANKING, REAL, RECENT, RELATIONAL, ROWS, RSTREAM
S	SECOND, SELECT, SMALLINT, SOME, SQU, SUB, SUM
T	THEN, TINYINT, TIME, TIMESTAMP, TRUE
U	UNBOUNDED, UNION, UNKNOWN, UPDATE
V	VARBINARY, VARCHAR
W	WHEN, WHERE, WITH, WQU
X	No reserved words
Y	No reserved words
Z	No reserved words