30 lines
920 B
MySQL
30 lines
920 B
MySQL
|
-- WITH common_table_expression [ , ... ]
|
||
|
|
-- expression_name [ ( column_name [ , ... ] ) ] [ AS ] ( query )
|
||
|
|
|
||
|
|
|
||
|
|
-- CTE with multiple column aliases
|
||
|
|
WITH t(x, y) AS (SELECT 1, 2)
|
||
|
|
SELECT * FROM t WHERE x = 1 AND y = 2;
|
||
|
|
|
||
|
|
-- CTE in CTE definition
|
||
|
|
WITH t AS (WITH t2 AS (SELECT 1) SELECT * FROM t2) SELECT * FROM t;
|
||
|
|
|
||
|
|
-- CTE in subquery expression
|
||
|
|
SELECT (WITH t AS (SELECT 1) SELECT * FROM t);
|
||
|
|
|
||
|
|
-- CTE in CREATE VIEW statement
|
||
|
|
CREATE VIEW v AS WITH t(a, b, c, d) AS (SELECT 1, 2, 3, 4) SELECT * FROM t;
|
||
|
|
SELECT * FROM v;
|
||
|
|
|
||
|
|
-- If name conflict is detected in nested CTE, then AnalysisException is thrown by default.
|
||
|
|
-- SET spark.sql.legacy.ctePrecedencePolicy = CORRECTED (which is recommended),
|
||
|
|
-- inner CTE definitions take precedence over outer definitions.
|
||
|
|
SET spark.sql.legacy.ctePrecedencePolicy = CORRECTED;
|
||
|
|
WITH
|
||
|
|
t AS (SELECT 1),
|
||
|
|
t2 AS (
|
||
|
|
WITH t AS (SELECT 2)
|
||
|
|
SELECT * FROM t
|
||
|
|
)
|
||
|
|
SELECT * FROM t2;
|