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FIND_IN_SET() vs IN()
...CompanyIDs | '}')::INT[])
WHERE orderID = 1
and this would even use an index on companyID.
Unfortunately, this does not work in MySQL since the latter does not support arrays.
You may find this article interesting (see #2):
10 things in MySQL (that won’t work as expected)
Update:
If the...
What's the need of array with zero elements?
...variable-size data member. By declaring it as a 0-length array, it can be indexed just as any other array. You'd then allocate a bts_action struct, of say 1024-byte data size, like so:
size_t size = 1024;
struct bts_action* action = (struct bts_action*)malloc(sizeof(struct bts_action) + size);
...
How to represent empty char in Java Character class
... main(String[] args) throws Exception {
String s = "abcdefg";
int index = s.indexOf('d');
// delete a char from a char[]
char[] array = s.toCharArray();
char[] tmp = new char[array.length-1];
System.arraycopy(array, 0, tmp, 0, index);
System.arraycopy(array, index+1, tm...
Pandas DataFrame Groupby two columns and get counts
...e your second question:
In [56]: df.groupby(['col5','col2']).size().reset_index().groupby('col2')[[0]].max()
Out[56]:
0
col2
A 3
B 2
C 1
D 3
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foreach with index [duplicate]
Is there a C# equivalent of Python's enumerate() and Ruby's each_with_index ?
10 Answers
...
What is the best way to tell if a character is a letter or number in Java without using regexes?
What is the best and/or easiest way to recognize if a string.charAt(index) is an A-z letter or a number in Java without using regular expressions? Thanks.
...
How do you merge two Git repositories?
...ngly simple.
(1) In A,
PREFIX=projectA #adjust this
git filter-branch --index-filter '
git ls-files -s |
sed "s,\t,&'"$PREFIX"'/," |
GIT_INDEX_FILE=$GIT_INDEX_FILE.new git update-index --index-info &&
mv $GIT_INDEX_FILE.new $GIT_INDEX_FILE
' HEAD
Note: This rewrites ...
Fast way of finding lines in one file that are not in another?
... # preserve whitespace
(NR==FNR) { ll1[FNR]=$0; nl1=FNR; } # file1, index by lineno
(NR!=FNR) { ss2[$0]++; } # file2, index by string
END {
for (ll=1; ll<=nl1; ll++) if (!(ll1[ll] in ss2)) print ll1[ll]
}
This stores the entire contents of file1 line by line in a line-...
Oracle find a constraint
...l constraints an explicit name. For instance, if the database creates an index for the primary key (which it will do if that column is not already indexed) it will use the constraint name oo name the index. You don't want a database full of indexes named like SYS_C00935191.
To be honest most p...
Fast Bitmap Blur For Android SDK
...s very pretty and quite fast too.
Update for people encountering the ArrayIndexOutOfBoundsException problem : @anthonycr in the comments provides this information :
I found that by replacing Math.abs with StrictMath.abs or some other
abs implementation, the crash does not occur.
/**
* Sta...