In daily development, it is often necessary to list all the time in a certain period of time. At this time, it is impossible to query from the existing tables in the database, and there may be confirmation. At this time, the function generate_series is used
Requirement: List all the months in 2019
SQL text:
select to_char(generate_series(date_trunc('month',to_date('20190101','yyyymmdd')),date_trunc('month',to_date('20191201','yyyymmdd')),'1 month'),'yyyymm') as yyyymm
The execution results are as follows:
