Oracle 5.0 Reference Manual page 899

•
expr NOT IN (value,...)
This is the same as
NOT (expr IN
• [879]
ISNULL(expr)
If is NULL,
expr ISNULL()
mysql> SELECT ISNULL(1+1);
-> 0
mysql> SELECT ISNULL(1/0);
-> 1
[879] can be used instead of
ISNULL()
value to using
NULL
The [879]
ISNULL()
comparison operator. See the description of
•
INTERVAL(N,N1,N2,N3,...)
Returns if < N1,
0 N 1
is required that <
N1
search is used (very fast).
mysql> SELECT INTERVAL(23, 1, 15, 17, 30, 44, 200);
-> 3
mysql> SELECT INTERVAL(10, 1, 10, 100, 1000);
-> 2
mysql> SELECT INTERVAL(22, 23, 30, 44, 200);
-> 0
•
LEAST(value1,value2,...)
With two or more arguments, returns the smallest (minimum-valued) argument. The arguments are
compared using the following rules:
• If the return value is used in an
compared as integers.
• If the return value is used in a
as reals.
• If the arguments comprise a mix of numbers and strings, they are compared as numbers.
• If any argument is a nonbinary (character) string, the arguments are compared as nonbinary
strings.
• In all other cases, the arguments are compared as binary strings.
Before MySQL 5.0.13,
returns if any argument is NULL.
NULL
mysql> SELECT LEAST(2,0);
-> 0
mysql> SELECT LEAST(34.0,3.0,5.0,767.0);
-> 3.0
mysql> SELECT LEAST('B','A','C');
-> 'A'
Note that the preceding conversion rules can produce strange results in some borderline cases:
mysql> SELECT CAST(LEAST(3600, 9223372036854775808.0) as SIGNED);
-> -9223372036854775808
Comparison Functions and Operators
[879]
(value,...)).
[879] returns 1, otherwise it returns 0.
[875]
=
[875] always yields false.)
=
function shares some special behaviors with the
[879]
if < and so on or
N N2
< < < for this function to work correctly. This is because a binary
N2 N3 ... Nn
[879]
INTEGER
context or all arguments are real-valued, they are compared
REAL
[879] returns
LEAST()
879
to test whether a value is NULL. (Comparing a
[877].
IS NULL
if is NULL. All arguments are treated as integers. It
-1 N
context or all arguments are integer-valued, they are
only if all arguments are NULL. As of 5.0.13, it
NULL
[877]
IS NULL