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Select count(*) from multiple tables
How can I select count(*) from two different tables (call them tab1 and tab2 ) having as result:
18 Answers
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using awk with column value conditions
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132
If you're looking for a particular string, put quotes around it:
awk '$1 == "findtext" {print...
Get the first element of each tuple in a list in Python [duplicate]
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196
Use a list comprehension:
res_list = [x[0] for x in rows]
Below is a demonstration:
>&g...
How do I return rows with a specific value first?
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196
On SQL Server, Oracle, DB2, and many other database systems, this is what you can use:
ORDER ...
How to draw a rounded Rectangle on HTML Canvas?
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12 Answers
12
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Using a dictionary to count the items in a list [duplicate]
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in 2.7 and 3.1 there is special Counter dict for this purpose.
>>> from collections import Counter
>>> Counter(['apple','red','apple','red','red','pear'])
Counter({'red': 3, 'apple': 2, 'pear': 1})
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What is the fastest way to get the value of π?
... are a lot of formulae.
Here is a method that converges quickly — about 14 digits per iteration. PiFast, the current fastest application, uses this formula with the FFT. I'll just write the formula, since the code is straightforward. This formula was almost found by Ramanujan and discovered by Ch...
Loop through each row of a range in Excel
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151
Dim a As Range, b As Range
Set a = Selection
For Each b In a.Rows
MsgBox b.Address
Next
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