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How to use count and group by at the same select statement
...atement.
Is there a way for this directly from sql?
For example, having a table with users I want to select the different towns and the total number of users
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SET NAMES utf8 in MySQL?
...ters to show on websites properly when the data was queried from MySQL. My tables and columns are set to UTF-8 in MySQL—so should this be necessary?
– NexusRex
Aug 30 '11 at 19:15
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Why is std::map implemented as a red-black tree?
...d red black probably only remains for historical reasons.
Why not a hash table?
A type only requires < operator (comparison) to be used as a key in a tree. However, hash tables require that each key type has a hash function defined. Keeping type requirements to a minimum is very important for ...
SQL WHERE condition is not equal to?
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You can do like this
DELETE FROM table WHERE id NOT IN ( 2 )
OR
DELETE FROM table WHERE id <> 2
As @Frank Schmitt noted, you might want to be careful about the NULL values too. If you want to delete everything which is not 2(including the NULLs...
Conditional formatting based on another cell's value
...zing feature is capable of, and especially how the $ thing works.
Example table
The color from D to G depend on the values in columns A, B and C. But the formula needs to check values that are fixed horizontally (user, start, end), and values that are fixed vertically (dates in row 1). That's wh...
What are the “must have” jQuery plugins? [closed]
...n those which are likely to be useful in general UI development, such as Tablesorter , rather than those which serve uncommon needs.
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Parse usable Street Address, City, State, Zip from a string [closed]
...dual sections of the address into their appropriate fields in a normalized table. I need to do this for approximately 4,000 records and it needs to be repeatable.
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How to change a nullable column to not nullable in a Rails migration?
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This causes problems when the table already has null values. See my answer
– Rick Smith
Aug 8 '14 at 20:27
5
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How to change the style of alert box?
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the custom alert in the answer is not compatable to the native alert. The native alert and prompt are block-and-wait.
– Beeno Tung
Jun 17 '19 at 8:32
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CMake使用教程 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ab/testngpp/cmake-2.8.1/Tests/Tutorial/Step1/build3>make
Linking CXX executable Tutorial.exe
[100%] Built target Tutorial
可以运行一下Turorial.exe：
D:/Projects/Lab/testngpp/cmake-2.8.1/Tests/Tutorial/Step1/build3>Tutorial.exe
Tutorial.exe Version 1.0
Usage: Tutorial.exe number
D:/Pr...