ClickHouse/tests/queries/0_stateless/03039_recursive_cte_postgres_5.sql

/**
  * Based on https://github.com/postgres/postgres/blob/master/src/test/regress/sql/with.sql, license:
  *
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  * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
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--
-- Tests for common table expressions (WITH query, ... SELECT ...)
--

-- { echoOn }

--
-- test multiple WITH queries
--
WITH RECURSIVE
  y AS (SELECT 1 AS id),
  x AS (SELECT * FROM y UNION ALL SELECT id+1 FROM x WHERE id < 5)
SELECT * FROM x;

-- forward reference OK
WITH RECURSIVE
    x AS (SELECT * FROM y UNION ALL SELECT id+1 FROM x WHERE id < 5),
    y AS (SELECT 1 AS id)
 SELECT * FROM x;

WITH RECURSIVE
   x AS
     (SELECT 1 AS id UNION ALL SELECT id+1 FROM x WHERE id < 5),
   y AS
     (SELECT 1 AS id UNION ALL SELECT id+1 FROM y WHERE id < 10)
 SELECT y.*, x.* FROM y LEFT JOIN x USING (id);

WITH RECURSIVE
   x AS
     (SELECT 1 AS id UNION ALL SELECT id+1 FROM x WHERE id < 5),
   y AS
     (SELECT 1 AS id UNION ALL SELECT id+1 FROM x WHERE id < 10)
 SELECT y.*, x.* FROM y LEFT JOIN x USING (id);

WITH RECURSIVE
   x AS
     (SELECT 1 AS id UNION ALL SELECT id+1 FROM x WHERE id < 3 ),
   y AS
     (SELECT * FROM x UNION ALL SELECT * FROM x),
   z AS
     (SELECT * FROM x UNION ALL SELECT id+1 FROM z WHERE id < 10)
 SELECT * FROM z;

WITH RECURSIVE
   x AS
     (SELECT 1 AS id UNION ALL SELECT id+1 FROM x WHERE id < 3 ),
   y AS
     (SELECT * FROM x UNION ALL SELECT * FROM x),
   z AS
     (SELECT * FROM y UNION ALL SELECT id+1 FROM z WHERE id < 10)
 SELECT * FROM z;

-- { echoOff }