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“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
...d in the changed row.
See demonstration below, tested with Percona Server 5.5.28. The configuration variable innodb_autoinc_lock_mode=1 (the default):
mysql> create table foo (id serial primary key, u int, unique key (u));
mysql> insert into foo (u) values (10);
mysql> select * from foo;...
What is the benefit of zerofill in MySQL?
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When you select a column with type ZEROFILL it pads the displayed value of the field with zeros...
Why can't I push to this bare repository?
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ahsteele
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answered May 27 '11 at 21:14
Seth Robert...
How to Get True Size of MySQL Database?
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edited Oct 31 '18 at 15:52
sjas
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answered J...
Iterating over every two elements in a list
...mport izip
def pairwise(iterable):
"s -> (s0, s1), (s2, s3), (s4, s5), ..."
a = iter(iterable)
return izip(a, a)
for x, y in pairwise(l):
print "%d + %d = %d" % (x, y, x + y)
Or, more generally:
from itertools import izip
def grouped(iterable, n):
"s -> (s0,s1,s2,...sn...
How to express a NOT IN query with ActiveRecord/Rails?
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python plot normal distribution
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answered Apr 13 '12 at 9:25
unutbuunutbu
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Pairwise crossproduct in Python [duplicate]
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153
You're looking for itertools.product if you're on (at least) Python 2.6.
>>> import i...
Difference between parameter and argument [duplicate]
...:
int foo(int x, int y) {
...
}
Whereas here, in the function call, 5 and z are the actual arguments:
foo(5, z);
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What do column flags mean in MySQL Workbench?
... values.)
UN - Unsigned (non-negative numbers only. so if the range is -500 to 500, instead its 0 - 1000, the range is the same but it starts at 0)
UQ - Create/remove Unique Key
ZF - Zero-Filled (if the length is 5 like INT(5) then every field is filled with 0’s to the 5th digit. 12 = 000...