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Create unique constraint with null columns
..., menu_id, recipe_id)
WHERE menu_id IS NOT NULL;
CREATE UNIQUE INDEX favo_2col_uni_idx ON favorites (user_id, recipe_id)
WHERE menu_id IS NULL;
This way, there can only be one combination of (user_id, recipe_id) where menu_id IS NULL, effectively implementing the desired constraint.
Possible dra...
Calculate business days
I need a method for adding "business days" in PHP. For example, Friday 12/5 + 3 business days = Wednesday 12/10.
36 Answers...
Why can't I reference System.ComponentModel.DataAnnotations?
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edited Mar 29 '13 at 20:01
Joseph Gabriel
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Why does Typescript use the keyword “export” to make classes and interfaces public?
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How to append to New Line in Node.js
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answered Apr 30 '12 at 13:17
Rob HruskaRob Hruska
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What exactly does git's “rebase --preserve-merges” do (and why?)
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What's the common practice for enums in Python? [duplicate]
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edited Mar 31 '09 at 20:39
answered Mar 31 '09 at 20:30
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Hash collision in git
...aracter times 40... 160 bits. Now we know 10 bits is approximately 1000 (1024 to be exact) meaning that there are 1 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 different SHA-1 hashes... 1048.
What is this equivalent of? Well the Moon is made up of about 1047 atoms. So if we have ...
Change Default Scrolling Behavior of UITableView Section Header
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edited Nov 14 '13 at 12:35
Fattie
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How to reset radiobuttons in jQuery so that none is checked
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In versions of jQuery before 1.6 use:
$('input[name="correctAnswer"]').attr('checked', false);...