avg aggregator and link to Postgres aggregate function docs
QueryRunner for strings
TODO about improving product-profunctor TH
Add basic tutorial
Nullability in basic tutorial
Tutorial needs postgresql-simple
connectInfo -> connection
QueryRunner instance for Nullable String
Prevent name class
Nullable example for runQuery
Simplify Default QueryRunners
Create Opaleye.Internal.RunQuery
RunQuery.queryRunnerColumn and some docs for query running
Clarify that unsafeCoerce is from Column
Comments about "idealized" SQL
Improve synopsis
Change the type on the Unpackspecs of insert returning things for better inference when using def explicitly
Add TutorialManipulation
Use HaskellDB's Generator for manipulation
Use sqlInsert from HaskellDB's Generator