Method column_as

src/query/helper.rs:87–98

Add a select column with alias ``` use sea_orm::{entity::*, query::*, tests_cfg::cake, DbBackend}; assert_eq!( cake::Entity::find() .select_only() .column_as(cake::Column::Id.count(), "count") .build(DbBackend::Postgres) .to_string(), r#"SELECT COUNT("cake"."id") AS "count" FROM "cake""# ); ```

(mut self, col: C, alias: I)

    /// );
    /// ```
    fn column_as<C, I>(mut self, col: C, alias: I) -> Self
    where
        C: ColumnAsExpr,
        I: IntoIdentity,
    {
        self.query().expr(SelectExpr {
            expr: col.into_column_as_expr(),
            alias: Some(SeaRc::new(alias.into_identity())),
            window: None,
        });
        self
    }

    /// Select columns
    ///