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Questions - conditional-aggregation

Single columns from several rows into several columns in one record, but allow NULL in the rows

I'm trying to combine single rows from multiple records into several columns in one record. Say we have a database of people and they've all chosen 2 numbers. But, some people have only chosen 1 numbe...
test-img

lemuria

sql

sqlite

group-by

left-join

conditional-aggregation

Votes: 0

Answers: 1

Latest Answer

You can use conditional aggregation: SELECT p.*, MAX(CASE WHEN c.type = 'first' THEN c.chosen_num END) AS first_num, MAX(CASE WHEN c.type = 'second' THEN c.chosen_num END) AS second_num ...
test-img

forpas

Room/SQLite returning two different results in one query

So I've got the following queries: //returns min max value my odomoter field must have @Query("SELECT MAX(odometer) FROM MaintenanceRecord WHERE vehicleId = :maintenanceVehicleId AND " + ...
test-img

igodie

android

sqlite

android-sqlite

android-room

conditional-aggregation

Votes: 0

Answers: 1

Latest Answer

You can use conditional aggregation to get both columns in a single query: SELECT MAX(CASE WHEN maintenanceTs < :dateAsLong THEN odometer END) AS max_odometer, MIN(CASE WHEN CAST(strftime('%...
test-img

forpas

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