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What is a Y-combinator? [closed]
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It is slightly more than a link though; it is a link with a very brief summary. A longer summary would be appreciated.
– Martijn Pieters♦
Aug 5 '15 at 13:16
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Distributed sequence number generation?
... unique, they're only very highly likely to be unique. (To collide, one or more generators would have to create the same random value at the exact same time.) Something along the lines of:
The most significant 32 bits: Timestamp, the generation time of the ID.
The least significant 32 bits: 32-bit...
Number of days between two NSDates [duplicate]
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How do I check if a string is valid JSON in Python?
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SQL Joins Vs SQL Subqueries (Performance)?
...g on...
If it is less data around 20k. JOIN works better.
If the data is more like 100k+ then IN works better.
If you do not need the data from the other table, IN is good, But it is alwys better to go for EXISTS.
All these criterias I tested and the tables have proper indexes.
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How to prevent form resubmission when page is refreshed (F5 / CTRL+R)
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Django Forms: if not valid, show form with error message
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