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WITH w AS MATERIALIZED (
SELECT * FROM other_table
)
SELECT * FROM w AS w1 JOIN w AS w2 ON w1.key = w2.ref
WHERE w2.key = 123;
WITH w AS NOT MATERIALIZED (
SELECT * FROM big_table
)
SELECT * FROM w AS w1 JOIN w AS w2 ON w1.key = w2.ref
WHERE w2.key = 123;
WITH RECURSIVE search_tree(id, link, data) AS (
SELECT t.id, t.link, t.data
FROM tree t
UNION ALL
SELECT t.id, t.link, t.data
FROM tree t, search_tree st
WHERE t.id = st.link
) SEARCH DEPTH FIRST BY id SET ordercol
SELECT * FROM search_tree ORDER BY ordercol;
WITH RECURSIVE search_tree(id, link, data) AS (
SELECT t.id, t.link, t.data
FROM tree t
UNION ALL
SELECT t.id, t.link, t.data
FROM tree t, search_tree st
WHERE t.id = st.link
) SEARCH BREADTH FIRST BY id SET ordercol
SELECT * FROM search_tree ORDER BY ordercol;
WITH RECURSIVE search_graph(id, link, data, depth) AS (
SELECT g.id, g.link, g.data, 1
FROM graph g
UNION ALL
SELECT g.id, g.link, g.data, sg.depth + 1
FROM graph g, search_graph sg
WHERE g.id = sg.link
) CYCLE id SET is_cycle USING path
SELECT * FROM search_graph;
-- test that DML queries are also selectable
WITH tbl AS (
INSERT INTO a VALUES (5) RETURNING *
)
SELECT * FROM tbl;
WITH tbl AS (
UPDATE a SET b = 5 RETURNING *
)
SELECT * FROM tbl;
WITH tbl AS (
DELETE FROM a RETURNING *
)
SELECT * FROM tbl;
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