<< (bitwise shift left)
Returns the bitwise shift left of a numeric expression
Syntax
expr << n --> integer
expr ::= integer
n ::= integer
Arguments
Parameter |
Description |
|---|---|
|
Integer expressions |
|
Number of bits to shift by |
Returns
Returns an integer that is the input shifted left by n positions.
Notes
If either value is NULL, the result is NULL.
Examples
master=> SELECT 16 << 1;
32
master=> SELECT 16 << 2;
64
master=> select 1 << 1;
2
master=> CREATE TABLE bit(b1 int, b2 int, b3 int);
executed
master=> INSERT INTO bit VALUES (1,2,3), (2, 4, 6), (4, 2, 6), (2, 8, 16), (null, null, 64), (5, 3, 1), (6, 1, 0);
executed
SELECT b1, b2, b3, b1 << b2, b2 << b3, b1 << 1 FROM bit;
b1 | b2 | b3 | ?column? | ?column?0 | ?column?1
---+----+----+----------+-----------+----------
1 | 2 | 3 | 4 | 16 | 2
2 | 4 | 6 | 32 | 256 | 4
4 | 2 | 6 | 16 | 128 | 8
2 | 8 | 16 | 512 | 524288 | 4
| | 64 | | |
5 | 3 | 1 | 40 | 6 | 10
6 | 1 | 0 | 12 | 1 | 12