mongodb select all in pipeline code example
Example 1: get all db sizes in mysql server
SELECT table_schema "DB Name",
ROUND(SUM(data_length + index_length) / 1024 / 1024, 1) "DB Size in MB"
FROM information_schema.tables
GROUP BY table_schema;
Example 2: sql run multiple updates in one query
UPDATE table_name
SET field_name =
case field_name2
when 'value' then 'change_to'
when 'value2' then 'change_to2'
end