Please help me with this SQL query
I'm practicing of SQL queries and met one involving the extraction of data from 3 different tables.The three paintings are as below
< pre >
Country
Location_id country
LOC1 Spain
loc2 England
LOC3 Spain
loc4 USA
loc5 Italy
loc6 USA
loc7 USA
< / pre >
< pre >
User
user_id location_id
loc1 U1
loc1 U2
loc2 U3
loc2 U4
loc1 U5
U6 loc3
< / pre >
< pre >
Publish
user_id post_id
P1 u1
P2 u1
U2 P3
P4 u3
P5 u1
P6 u2
< / pre >
I am trying to write a SQL query - for each country of the users, showing the average number of positions
I understand the logic behind all this that we must first consolidate all locations, and then the users in one country and then find the way to their positions.
But, I'm having a difficulty to this format SQL. Could someone help me please with this request.
Thank you.
Select
Country.Country,
Count (*) Totalpostspercountry,
Count (distinct post.user_id) Totaldistincuserspercountry,
count (*) / count (distinct post.user_id) Avgpostsperuserbycountry
Of
countries, have, post
where country.location_id = muser.location_id
and muser.user_id = post.user_id
Country.country group
The output is like this for your sample data - hope that's what you're looking for :)
COUNTRY, TOTALPOSTSPERCOUNTRY, TOTALDISTINCUSERSPERCOUNTRY, AVGPOSTSPERUSERBYCOUNTRY
In England, 1, 1, 1.
Spain, 5, 2, 2.5.
Tags: Database
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PhaniHello, Fabienne,.
This race for you (twisted code of Sarma):
SELECT patient_id, first_name, last_name, address, city, type, startdate, enddate FROM ( SELECT a.patient_id patient_id, first_name, last_name, address, city, type, startdate, enddate, ROW_NUMBER() OVER (PARTITION BY p.patient_id ORDER BY CASE type WHEN 'P' THEN 1 WHEN 'M' THEN 2 WHEN 'D' THEN 3 END) rn FROM patient p JOIN address a ON (p.patient_id = a.patient_id ) WHERE NVL(valid_flg, 'X') != 'N' AND SYSDATE BETWEEN startdate AND NVL(enddate, SYSDATE) ) WHERE rn = 1;Edit, currently in the trial:
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grant select, insert, update, delete on all the tables in the schema of analysis
grant select on all the analysis schema views
grant to run on all procedures and packages to the scheme of analysis
creation of synonyms in the scheme of analysis for all tables, views, sequences, etc.You can do all this programmatically in a loop instead of write for each object separatelly.
Denes Kubicek
------------------------------------------------------------------------------
http://deneskubicek.blogspot.com/
http://www.Opal-consulting.de/training
http://Apex.Oracle.com/pls/OTN/f?p=31517:1
------------------------------------------------------------------------------ -
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Please help me with this procedure
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(
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exception
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