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How to implement a unique index on two columns in rails
...ue index on two columns. Those columns are also indexed. So my question is if I just can remove the indexes who were just for one column or if I have to use all three indexes:
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How can I filter a Django query with a list of values?
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will it raise error if we pass empty list or return no record ?
– Rakmo
Apr 12 '18 at 18:10
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How can I see the current value of my $PATH variable on OS X?
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Thank you. I would greatly appreciate if you could checkout the other question listed. But thanks for the clarification on $PATH.
– Karoh
Jan 31 '13 at 2:00
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Adjusting Eclipse console size
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#lifehack you can search the preferences with the string "console" to IMO more easily get to the setting
– Trevor Boyd Smith
Jul 5 '16 at 21:05
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What is the difference between a database and a data warehouse?
What is the difference between a database and a data warehouse?
13 Answers
13
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How do I disconnect all other users in tmux?
...they col/lines as well as the last used time. Note the uppercase D, i.e. Shift+d.
You could also use tmux's detach-client option
detach-client [-P] [-a] [-s target-session] [-t target-client]
(alias: detach)
Detach the current client if bound to a key, the client specified...
text flowing out of div
... container block (div):
overflow-wrap: break-word;
According to the specifications (source CSS | MDN):
The overflow-wrap CSS property specifies whether or not the browser should insert line breaks within words to prevent text from overflowing its content box.
With the value set to break-wor...
How do I put a clear button inside my HTML text input box like the iPhone does?
...rch"> instead of <input type="text">. It'll show the (browser-specific) clear button on HTML5 capable browsers.
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How to merge two files line by line in Bash
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How does it work if I would like to use a delimiter?
– Teja
Apr 29 '16 at 14:31
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How to invert a grep expression
... be matched. Those who are looking to invert the return code (i.e. succeed if all of the lines do not match the pattern, rather than at least one) should use ! grep. This finds use in conditional expressions, e.g.: if ! ls | grep -qE ".(\.exe)$"; then echo No .exe files in $(pwd); fi.
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