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SQL:With

Syntax 

WITH 테이블이름 AS ( SELECT 절 ) SELECT 절

스타일 가이드

Do not use nested queries. Instead, use common table expressions to improve readability.

Good: 

WITH sample AS (
  SELECT
    client_id,
    submission_date
  FROM
    main_summary
  WHERE
    sample_id = '42'
)

SELECT *
FROM sample
LIMIT 10

Bad: 

SELECT *
FROM (
  SELECT
    client_id,
    submission_date
  FROM
    main_summary
  WHERE
    sample_id = '42'
)
LIMIT 10

여러개 with

콤마(,)로 구분하면 된다. 

WITH sample AS (
  SELECT * FROM aa WHERE uid=42
), sample2 AS (
  SELECT * FROM bb WHERE uid=43
)
SELECT * FROM sample, sample2;

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