rubypdf, Page 2

How to Get the Row numbers of all tables in PostgreSQL Database

SELECT schemaname,relname,n_live_tup 
  FROM pg_stat_user_tables 
  ORDER BY n_live_tup DESC;

SELECT schemaname,relname,n_live_tup

FROM pg_stat_user_tables

ORDER BY n_live_tup DESC;

Recently, I imported 25 Excels into PostgreSQL separate tables with R, after imported, I was told there existed two excel files …

first show the sql,

select (array['Sun' ,'Mon', 'Tue', 'Wed', 'Thur', 'Fri', 'Sat'])
[extract(dow from  now())+1];

1 2	select (array['Sun' ,'Mon', 'Tue', 'Wed', 'Thur', 'Fri', 'Sat']) [extract(dow from now())+1];

dow means The day of week as Sunday (0) to Saturday (6), so you just need now …

Just like RStudio IDE is for R, Rodeo is for Python, An IDE for data science, they are use the same tech and similar …