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What's the best way to select data from multiple tables in androids sqlite


What's the best way to select data from multiple tables in androids sqlite

By : greentea
Date : November 21 2020, 01:01 AM
hop of those help? I'm trying out some new stuff with sqlite on android. , You need rawQuery method.
Example:
code :
private final String MY_QUERY = "SELECT * FROM table_a a INNER JOIN table_b b ON a.id=b.other_id WHERE b.property_id=?";

db.rawQuery(MY_QUERY, new String[]{String.valueOf(propertyId)});


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Whats the best way to select fields from multiple tables with a common prefix?

Whats the best way to select fields from multiple tables with a common prefix?


By : Yassine Kassi
Date : March 29 2020, 07:55 AM
will help you I see you are using Postgresql. This is an ideal case for partitioning with constraint exclusion based on dates. You create one master table without data, and the other tables added daily inherit from it. In your case, you don't even have to worry about the nuisance of triggers on INSERT; sounds like there is never any insertion other than the daily bulk creation of a new table. See the link above for full documentation.
Queries can be run against the parent table, and Postgres takes care of looking in all the child tables, plus it is smart enough to skip child tables ruled out by WHERE criteria.
How to select sqlite result from multiple tables with multiple foreign keys

How to select sqlite result from multiple tables with multiple foreign keys


By : sam
Date : March 29 2020, 07:55 AM
I wish did fix the issue. When joining tables you almost always want to include an explicit join condition. The SQLite syntax diagrams may be helpful:
code :
select student.student_name, exams.exam_code, ...
from student
join wrote_exam using (student_number)
join exams using (exam_code)
where ...
select student.student_name, exams.exam_code, ...
from student
join wrote_exam on student.student_number = wrote_exam.student_number
join exams on exams.exam_code = wrote_exam.exam_code
where ...
Sqlite select * from multiple tables

Sqlite select * from multiple tables


By : Apollo Eric
Date : March 29 2020, 07:55 AM
it should still fix some issue Use UNION or UNION ALL. The first removes duplicates from the result set, the second one doesn't.
code :
SELECT * FROM table1
UNION
SELECT * FROM table2
Select max from multiple tables using angularjs and sqlite

Select max from multiple tables using angularjs and sqlite


By : user3338742
Date : March 29 2020, 07:55 AM
help you fix your problem I have a table called "clientes" and another one called "phones", both of them have a column "_modificado" which have a timestamp, I use a function to get the last modified item to compare with my api and then update it. , Compute the maximum for each table, then combine them:
code :
SELECT MAX((SELECT MAX(_modification) FROM clientes),
           (SELECT MAX(_modification) FROM phones  )) AS lastS
SQLite script SELECT from multiple tables

SQLite script SELECT from multiple tables


By : Jayant Joshi
Date : March 29 2020, 07:55 AM
wish help you to fix your issue It's likely you have missing information in you database.
The "inner join" statement retrieve data only if there is one (or more) match with the joined table.
code :
"SELECT UserSpecies.commonName, UserSpecies.commonNameFR, UserSpecies.commonNameES, UserSpecies.commonNameDE, UserSpecies.speciesName, UserSpecies.speciesRegion, UserSpecies.speciesDetails, UserSpecies.maxSize, UserSpecies.creditSource, UserSpecies.UserCreated, UserSpecies.genusUC, UserSpecies.familyUC, UserSpecies.orderUC, UserSpecies.groupUC, UserSpecies.subGroupUC, UserSpecies.authority, Genus.name, Family.name, Orders.name, Groups.name, SubGroups.name, Types.name, IUCN.name 
FROM UserSpecies 
LEFT JOIN Genus ON UserSpecies.genusKey = Genus.id 
LEFT JOIN Family ON UserSpecies.familyKey = Family.id 
LEFT JOIN Orders ON UserSpecies.orderKey = Orders.id 
LEFT JOIN Groups ON UserSpecies.groupKey = Groups.id 
LEFT JOIN SubGroups ON UserSpecies.subGroupKey = SubGroups.id 
LEFT JOIN Types ON UserSpecies.typeKey = Types.id 
LEFT JOIN IUCN ON UserSpecies.iucnKey = IUCN.id 
WHERE UserSpecies.id = %d"
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