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How can I join multiple SQL tables using the IDs?
I have 4 different tables that I want to join. The tables are structured with columns as follows:
4 Answers
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In C/C++ what's the simplest way to reverse the order of bits in a byte?
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If you are talking about a single byte, a table-lookup is probably the best bet, unless for some reason you don't have 256 bytes available.
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How do I get SUM function in MySQL to return '0' if no values are found?
...Use COALESCE to avoid that outcome.
SELECT COALESCE(SUM(column),0)
FROM table
WHERE ...
To see it in action, please see this sql fiddle: http://www.sqlfiddle.com/#!2/d1542/3/0
More Information:
Given three tables (one with all numbers, one with all nulls, and one with a mixture):
SQL Fidd...
Recommendations of Python REST (web services) framework? [closed]
... You can write more RESTfull APIs using CherryPy docs.cherrypy.org/stable/progguide/REST.html
– Radian
Jan 1 '13 at 13:16
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Django - filtering on foreign key properties
I'm trying to filter a table in Django based on the value of a particular field of a ForeignKey .
3 Answers
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Generating an Excel file in ASP.NET [closed]
... Excel features
Do not require an install copy of Excel
Can generate Pivot tables
Can be generated using open source project EPPlus
Cons:
Limited compatibility outside Excel 2007 (shouldn't be a problem nowadays)
Complicated unless you're using a third party component
SpreadSheetML (open form...
Should I use the datetime or timestamp data type in MySQL?
...y default, so to solve that matter U should write Your own trigger to that table, to insert current date (without time) in the field/col with DATE mysql type.
– Arthur Kushman
Oct 15 '12 at 19:13
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MySQL dump by query
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not mysqldump, but mysql cli...
mysql -e "select * from myTable" -u myuser -pxxxxxxxxx mydatabase
you can redirect it out to a file if you want :
mysql -e "select * from myTable" -u myuser -pxxxxxxxx mydatabase > mydumpfile.txt
Update:
Original post asked if he could dump f...
Are soft deletes a good idea? [duplicate]
...ow have to include a WHERE IsDeleted = false clause in every query on this table (and so much worse if you're JOINing these tables). A mistake here would be caught as soon as a user or tester noticed a deleted record showing up again, which might take some time. Also, it would be easy for a develo...
An efficient compression algorithm for short text strings [closed]
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Check out Smaz:
Smaz is a simple compression library suitable for compressing very short
strings.
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