clarify ssh tricks

data/sql/tricks.md

@@ -1,10 +0,0 @@
----
-title: "tricks"
-tags: [ "Documentation", "data" ]
----
-
-# Find data from any table
-
-> pg_dump --data-only --inserts -U postgres your-db-name > a.tmp
-
-> grep 'my string' a.tmp