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How to add an auto-incrementing primary key to an existing table, in PostgreSQL?
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– leonbloy
May 16 '16 at 14:10
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How can I get all constants of a type by reflection?
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answered Jan 12 '17 at 16:16
BCABCA
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Mean per group in a data.frame [duplicate]
...egate(d[, 3:4], list(d$Name), mean)
Group.1 Rate1 Rate2
1 Aira 16.33333 47.00000
2 Ben 31.33333 50.33333
3 Cat 44.66667 54.00000
Here we aggregate columns 3 and 4 of data.frame d, grouping by d$Name, and applying the mean function.
Or, using a formula interface:
aggregate(....
django 1.5 - How to use variables inside static tag
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edited Apr 26 '14 at 20:16
Barney Szabolcs
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What is “String args[]”? parameter in main method Java
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Git asks for username every time I push
...r ZhugastrovAlexander Zhugastrov
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What does “Content-type: application/json; charset=utf-8” really mean?
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deceze♦deceze
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How to apply !important using .css()?
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edited Nov 6 '19 at 4:16
Makyen♦
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PostgreSQL Connection URL
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edited Apr 16 '18 at 17:05
Mike 'Pomax' Kamermans
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Appending to an empty DataFrame in Pandas?
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answered May 16 '13 at 20:58
DSMDSM
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