Let’s say I have the following two tables:
FILE_TBL ID (primary key) (some other stuff) TAGS_TBL ID (primary key) FILE_ID (references FILE_TBL.FILE_ID, indexed) TAG (varchar, indexed)
This is a many-to-one relationship; that is a single file can have any number of tags. Let’s say I’m searching for all files that have the tag “finance”. There are 3 ways I could do this:
Using a subquery:
select * from FILE_TBL where ID in (select FILE_ID from TAGS_TBL where TAG = 'finance')
Using a join with only on:
select FILE_TBL.* from FILE_TBL join TAGS_TBL on TAGS_TBL.FILE_ID = FILE_TBL.ID and TAGS_TBL.TAG = 'finance'
Using a join with with where:
select FILE_TBL.* from FILE_TBL join TAGS_TBL on TAGS_TBL.FILE_ID = FILE_TBL.ID where TAGS_TBL.TAG = 'finance'
Of these 3 methods, which one would you expect to perform the best on PostgreSQL for Aurora (frontend is based on Postgres 9.6.1, backend is amazon proprietary thing), and why? Note that I’m not actually selecting any data from
TAGS_TBL or using anything from it elsewhere in the query.
The “where in” version with the subquery seems the most readable and straightforward, but my gut says that it’s also the slowest.
✓ Extra quality
ExtraProxies brings the best proxy quality for you with our private and reliable proxies
✓ Extra anonymity
Top level of anonymity and 100% safe proxies – this is what you get with every proxy package
✓ Extra speed
1,ooo mb/s proxy servers speed – we are way better than others – just enjoy our proxies!
USA proxy location
We offer premium quality USA private proxies – the most essential proxies you can ever want from USA
Our proxies have TOP level of anonymity + Elite quality, so you are always safe and secure with your proxies
Use your proxies as much as you want – we have no limits for data transfer and bandwidth, unlimited usage!
Superb fast proxy servers with 1,000 mb/s speed – sit back and enjoy your lightning fast private proxies!
99,9% servers uptime
Alive and working proxies all the time – we are taking care of our servers so you can use them without any problems
No usage restrictions
You have freedom to use your proxies with every software, browser or website you want without restrictions
Perfect for SEO
We are 100% friendly with all SEO tasks as well as internet marketing – feel the power with our proxies
Buy more proxies and get better price – we offer various proxy packages with great deals and discounts
We are working 24/7 to bring the best proxy experience for you – we are glad to help and assist you!