iif
Syntax
iif(cond, trueResult, falseResult)
Arguments
cond is a Boolean scalar/vector/matrix. It can be an expression returning Boolean values.
trueResult and falseResult are scalars, or vectors of the same length as cond, or matrices of the same dimensions as cond.
Details
Element-wise conditional operation. cond is of Boolean type. If cond[i] is true, it returns trueResult(cond[i] ); otherwise it returns falseResult(cond[i] ). If cond[i] is NULL, it returns NULL.
Note: This function first parses the arguments and then returns trueResult or falseResult based on the result of cond.
Examples
$ iif(true true true false false false, 1..6, 6..1);
[1,2,3,3,2,1]
$ iif(1..6==3, 1, 2);
[2,2,1,2,2,2]
$ x=9 6 8;
$ iif(x<=8, 10*x, 20*x-80);
[100,60,80]
Use function iif
in a SQL statement:
$ t=table(1..5 as id, 11..15 as x);
$ t1=table(take(12,5) as a, take(14,5) as b);
$ t;
id |
x |
---|---|
1 |
11 |
2 |
12 |
3 |
13 |
4 |
14 |
5 |
15 |
$ t1;
a |
b |
---|---|
12 |
14 |
12 |
14 |
12 |
14 |
12 |
14 |
12 |
14 |
$ update t set x=iif(x<t1.a, t1.a, iif(x>t1.b,t1.b, x));
$ t;
id |
x |
---|---|
1 |
12 |
2 |
12 |
3 |
13 |
4 |
14 |
5 |
14 |
$ a = NULL 1 -3 5
$ iif(a > 0, a, 0)
[0, 1, 0, 5]
$ iif(nullCompare(>,a,0), a, 0)
[ , 1, 0, 5]
$ m1=1..6$3:2
$ m2=6..1$3:2
$ iif(m1>m2, m1, m2);
col1 |
col2 |
---|---|
6 |
4 |
5 |
5 |
4 |
6 |