This operator produces the SQL operator =, which is used to compare values for equality.

Example:

 query :: UserId -> SqlPersistT IO [Entity User]
 query userId = select $ do
     user <- from $ table @User
     where_ (user ^. UserId ==. val userId)
     pure user

This would generate the following SQL:

 SELECT user.*
 FROM user
 WHERE user.id = ?

This operator translates to the SQL operator !=.

Example:

 where_ $ user ^. UserName !=. val Bob

This operator translates to the SQL operator >=.

Example:

 where_ $ user ^. UserAge >=. val 21

This operator translates to the SQL operator >.

Example:

 where_ $ user ^. UserAge >. val 20

This operator translates to the SQL operator <=.

Example:

 where_ $ val 21 <=. user ^. UserAge

This operator translates to the SQL operator <.

Example:

 where_ $ val 20 <. user ^. UserAge

a between (b, c) translates to the SQL expression a >= b AND a <= c. It does not use a SQL BETWEEN operator.

@since: 3.1.0