Here is a handy sql script to get a list of tables by their size in Azure SQL Database
select schema_name(tab.schema_id) + '.' + tab.name as [tablename],
cast(sum(spc.used_pages * 8)/1024.00 as numeric(36, 2)) as used_spacemb,
cast(sum(spc.total_pages * 8)/1024.00 as numeric(36, 2)) as allocated_spacemb
from sys.tables tab
inner join sys.indexes ind
on tab.object_id = ind.object_id
inner join sys.partitions part
on ind.object_id = part.object_id and ind.index_id = part.index_id
inner join sys.allocation_units spc
on part.partition_id = spc.container_id
group by schema_name(tab.schema_id) + '.' + tab.name
order by sum(spc.used_pages) desc
The columns you will get from this script:
tablename
size_mb
allocated_spacemb