If I have two substring_index, which one gets executed first?

user9371654

If I have two substring_index, which one get executed first? the internal one substring_index(mycol,'/',3), or the external one ?

substring_index(substring_index(`mycol`,'/',3),'://',-1)

Examples of sting I want to treat:

https://www.yahoo.com/
http://google.com/en/

I want to get:

www.yahoo.com
google.com

1) Which substring_index get executed first? This important to know to construct the second substring_index according to the output of what executed first.

2) Is my substring_index statement correct?

scaisEdge

Asu you can easy check

select substring_index(substring_index('https://www.yahoo.com/','/',3),'://',-1);

www.yahoo.com

select substring_index(substring_index('http://google.com/en/','/',3),'://',-1);

google.com

for each nested function is always exectued the inner one .. and recorsively the next outer

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edited at2020-12-5

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