After installing SparkR, Let’s try to import data from PostgreSQL, #tell the path of Spark Sys.setenv(SPARK_HOME="/Users/steven/Applications/spark2") .libPaths(c(file.path(Sys.getenv("SPARK_HOME"), "R", "lib"), .libPaths())) ...
Tag: PostgreSQL
How to Get the Row numbers of all tables in PostgreSQL DatabaseHow 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; Recently, I imported 25 Excels into PostgreSQL separate tables with R, after ...
PostgreSQL:Get the Day Name of Week with One SQLPostgreSQL:Get the Day Name of Week with One SQL
first show the sql, select (array['Sun' ,'Mon', 'Tue', 'Wed', 'Thur', 'Fri', 'Sat']) [extract(dow from now())+1]; dow means The day of ...