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PGSqlPhriday #006: One Thing You Wish You Knew While Learning PostgreSQL: psql commands

Posted by Andreas 'ads' Scherbaum on

For this month's #PGSQLPhriday, Grant Fritchey asks: What is the one thing you wish you knew while you learn PostgreSQL.

My preferred client for PostgreSQL is psql, and while it is very powerful I like a few features a most:

  • \timing
  • \watch

Both are internal commands in psql, \timing is there for a very long time, but got improved at some point. \watch came later, but is also there for a couple years now.

 

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Single line input for psql copy command

Posted by Andreas 'ads' Scherbaum on

I have the following problem:

A database server and another client machine. I have to execute several \copy commands in psql on the client machine to retrieve data and store the output in CSV files. The PostgreSQL COPY command is not an option because it stores the results on the database server, not the client machine. All \copy commands are executed from several files containing SQL commands, which are concated together by a makefile and feeded into psql. So far so good.

My SELECT commands used in the \copy are a bit more complicated and \copy requires to have the entire command on a single line. That can be done in two ways:

- Write the entire command in a single line. But that's hard to debug :-(

- Write the command as i like it and remove the linebreaks before feeding the command into psql.

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