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Is having an 'OR' in an INNER JOIN condition a bad idea?
...o improve the speed of an immensely slow query (several minutes on two tables with only ~50,000 rows each, on SQL Server 2008 if it matters), I narrowed down the problem to an OR in my inner join, as in:
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Selecting data frame rows based on partial string match in a column
I want to select rows from a data frame based on partial match of a string in a column, e.g. column 'x' contains the string "hsa". Using sqldf - if it had a like syntax - I would do something like:
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C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术
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struct test t;
我们用gdb跟进去，对于实例t，我们可以看到：
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# t实例中的p就是一个野指针
(gdb) p t
$1 = {i = 0, c = 0 '\000', d = 0...
Fetch the row which has the Max value for a column
Table:
35 Answers
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How does Activity.finish() work in Android?
...lled finish() will run to completion. The finish() operation will not even begin until you return control to Android.
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PostgreSQL: Can you create an index in the CREATE TABLE definition?
I want to add indexes to some of the columns in a table on creation. Is there are way to add them to the CREATE TABLE definition or do I have to add them afterward with another query?
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Is it possible to declare git repository as dependency in android gradle?
...t way is:
https://jitpack.io
Step 1. Add the JitPack repository to build.gradle at the end of repositories:
repositories {
// ...
maven { url "https://jitpack.io" }
}
Step 2. Add the dependency in the form
dependencies {
compile 'com.github.User:Repo:Tag'
}
It is possible to buil...
Which iomanip manipulators are 'sticky'?
I recently had a problem creating a stringstream due to the fact that I incorrectly assumed std::setw() would affect the stringstream for every insertion, until I changed it explicitly. However, it is always unset after the insertion.
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What can MATLAB do that R cannot do? [closed]
...Then I wonder why they don't just use Octave or R . But is the latter right? Can you use R to replace MATLAB?
11 Answers...
Attach IntelliJ IDEA debugger to a running Java process
Is it possible to attach the IntelliJ IDEA debugger to a running Java process? If yes, how?
5 Answers
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