Let’s use || to prepend and append command fragments to create a valid command with the tablename as a parameter. Postgres=# SELECT tablename FROM pg_tables WHERE tablename~'^pgbench' Ģ. Let’s retrieve the relevant tables with names starting with pgbench Now, we could do this manually, or ask the database to automate the boring stuff.ġ. all those tables that match a certain prefix. Let’s assume a new user needs access to some tables in a schema, e.g. PostgreSQL can take the results of queries and add text to create commands with those results as arguments.įor this purpose, we can prepend or append text to any query result using the || operator. Sometimes it can be useful to automate such steps, not only in the interest of saving time, but also in the interest of avoiding errors due to typos or copy-pasting. Often, users simply rewrite the command over and over, or sometimes they may opt to use a text editor to write the command once, then copy and paste and edit it to accommodate different arguments. One common pattern is the need to run the same command with different arguments. However, psql is a very capable tool with lots of useful features. Like many CLI clients, it is often overlooked and replaced with something with a GUI, or it is only used for the most basic tasks, while more complex operations are carried out elsewhere. The CLI client that ships with PostgreSQL is called psql.
POSTGRESQL COMMANDS WITH EXAMPLES HOW TO
This blog will show you how to use the || operator and the \gexec command to avoid unnecessary repetition in your workflow. For PostgreSQL powerusers, automating repeated steps is becoming more and more necessary, and gexec can help.
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