QUALIFY

QUALIFY – overview

Allgemeiner Text zum Thema Filterung (WHERE, HAVING etc.), unabhängig von der Datenbank.

Example

BIGQUERY – code

 select customer_key
      , order_date
      , total_price
   from orders
qualify row_number() over
       (partition by customer_key
        order by order_date desc) = 1

Example

CLICKHOUSE – code

 select customer_key
      , order_date
      , total_price
   from orders
qualify row_number() over
       (partition by customer_key
        order by order_date desc) = 1

Example

DUCKDB – code

 select customer_key
      , order_date
      , total_price
   from orders
qualify row_number() over
       (partition by customer_key
        order by order_date desc) = 1

Example

EXASOL – code

 select customer_key
      , order_date
      , total_price
   from orders
qualify row_number() over
       (partition by customer_key
        order by order_date desc) = 1

Example

ORACLE – code

 select customer_key
      , order_date
      , total_price
   from orders
qualify row_number() over
       (partition by customer_key
        order by order_date desc) = 1

QUALIFY is not available for Postgres. But there is a proof of concept for Postgres.

no examples

Example

SNOWFLAKE – code

 select customer_key
      , order_date
      , total_price
   from orders
qualify row_number() over
       (partition by customer_key
        order by order_date desc) = 1

Common outro für QUALIFY