比较谓词 (degree > 1)

-- Row value expressions (equal)
(A, B)    =  (X, Y)
(A, B, C) =  (X, Y, Z)
-- greater than
(A, B)    >  (X, Y)

(A, B, C) >  (X, Y, Z)


-- greater or equal
(A, B)    >= (X, Y)


(A, B, C) >= (X, Y, Z)



-- Inverse comparisons

(A, B)    <> (X, Y)
(A, B)    <  (X, Y)
(A, B)    <= (X, Y)

-- Equivalent factored-out predicates (equal)
(A = X) AND (B = Y)
(A = X) AND (B = Y) AND (C = Z)
-- greater than
(A > X)
  OR ((A = X) AND (B > Y))
(A > X)
  OR ((A = X) AND (B > Y))
  OR ((A = X) AND (B = Y) AND (C > Z))
-- greater or equal
(A > X)
  OR ((A = X) AND (B > Y))
  OR ((A = X) AND (B = Y))
(A > X)
  OR ((A = X) AND (B > Y))
  OR ((A = X) AND (B = Y) AND (C > Z))
  OR ((A = X) AND (B = Y) AND (C = Z))
-- For simplicity, these predicates are shown in terms
-- of their negated counter parts
NOT((A, B) =  (X, Y))
NOT((A, B) >= (X, Y))
NOT((A, B) >  (X, Y))

-- With regular column expressions
(BOOK.AUTHOR_ID, BOOK.TITLE) = (1, 'Animal Farm')

-- With scalar subselects
(BOOK.AUTHOR_ID, BOOK.TITLE) = (
  SELECT PERSON.ID, 'Animal Farm'
  FROM PERSON
  WHERE PERSON.ID = 1
)

// Column expressions
row(BOOK.AUTHOR_ID, BOOK.TITLE).eq(1, "Animal Farm");

// Subselects
row(BOOK.AUTHOR_ID, BOOK.TITLE).eq(
  select(PERSON.ID, val("Animal Farm"))
  .from(PERSON)
  .where(PERSON.ID.eq(1))
);

row(AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME).eq("John", "Doe")

(
  AUTHOR.FIRST_NAME = 'John'
  AND AUTHOR.LAST_NAME = 'Doe'
)

(AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME) = ('John', 'Doe')

(
  coalesce(AUTHOR.FIRST_NAME),
  coalesce(AUTHOR.LAST_NAME)
) = ('John', 'Doe')

ROW (AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME) = ROW ('John', 'Doe')

(AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME) = (('John', 'Doe'))

(AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME) = (
  SELECT 'John', 'Doe'
  FROM (
    SELECT 1 AS "dual"
  ) AS "dual"
)

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