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Simple mysql packet statistics statement instance code

Source: Internet
Author: User
Keywords Network programming Mysql tutorial
Tags code how many mysql mysql tutorial name network network programming programming
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Simple mysql tutorial grouping statistics statement instance code
/ *
id name code_id code_name is_true score
1 Zhang San 1 handsome is 5
2 Zhang San 2 lavish is 4
3 Zhang San 1 handsome is 4
4 Zhang San 2 lavish no 3
5 Li Si 1 handsome is 5
6 Li Si 2 lavish is 3

Look at an example
mysql how to group statistics by name: [handsome] how many "yes" and "no", "lavish" how many "yes" and "no", and how many [score]

* /

select name,
sum (if (code_name = 'handsome' and is_true = 'yes', 1,0)),
sum (if (code_name = 'handsome' and is_true = 'no', 1,0)),
sum (if (code_name = 'lazy' and is_true = 'yes', 1,0)),
sum (if (code_name = 'lazy' and is_true = 'no', 1,0)),
count (*)
from table1
group by name

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Related Keywords:
mysql statistics mysql instance mysql update statistics mysql query statistics update statistics mysql mysql index usage statistics mysql show statistics
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