Jack jack-zheng
jack-zheng
/ MySQL Installation.md
Created
October 24, 2019 08:53
This postion is a notebook to collect the pythonic code I fetch when do code research.
it's a common requirement and some guys achieve this goal by using Numpy lib, but it's too heavy. you can do in this way:
import random
- Annotation are only metadata and do not contains any business logic
- Consumer is a piece of code which reads this information and then performs necessary logic
new an annotation called ToDo, we give it some value like value="reading", day=1 which means reading on Monday and print it to console.
declare annotation class - ToDo.java
- left join = left outer join
- for Orcle only, there is a special syntax for outer join (+), the table column with (+) is the extend one, with means the one value be null when on record matched
- a left join b on a.id = b.id, show all record of a and if no record in b, fill with null
tmp.db> .schema
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