未知列where子句

Question

I have following DQL query

SELECT
    ps.id,
    MAX(ps.dueDate) as due_date,
    u.firstName as first_name,
    u.lastName as last_name,
    u.email,
    IDENTITY(ps.loanApplication) as loan_application_id,
    DATE_DIFF(MAX(ps.dueDate), CURRENT_DATE()) as diff
FROM
    Loan\Entity\PaymentSchedule ps
LEFT JOIN
    ps.paymentType pt
LEFT JOIN
    ps.loanApplication la
LEFT JOIN
    la.status s
LEFT JOIN
    la.user u
WHERE
    pt.slug != :paymentSlug AND s.keyIdentifier = :status AND diff = 14
GROUP BY
    ps.loanApplication

Which translates to following SQL query

SELECT
    p0_.id AS id_0,
    MAX(p0_.due_date) AS sclr_1,
    u1_.first_name AS first_name_2,
    u1_.last_name AS last_name_3,
    u1_.email AS email_4,
    p0_.loan_application_id AS sclr_5,
    DATEDIFF(MAX(p0_.due_date), CURRENT_DATE) AS sclr_6 
FROM
    payment_schedule p0_
LEFT JOIN
    payment_type p2_ ON p0_.payment_type_id = p2_.id
LEFT JOIN
    loan_application l3_ ON p0_.loan_application_id = l3_.id
LEFT JOIN 
    loan_application_status l4_ ON l3_.loan_application_status_id = l4_.id
LEFT JOIN
    user u1_ ON l3_.user_id = u1_.id
WHERE
    p2_.slug <> ? AND l4_.key_identifier = ? AND sclr_6 = 14
GROUP BY
    p0_.loan_application_id

This gives me following error

======================================================================
 PDOException
 SQLSTATE[42S22]: Column not found: 1054 Unknown column 'sclr_6' in 'where clause'
----------------------------------------------------------------------

When i replace WHERE condition

WHERE pt.slug != :paymentSlug AND s.keyIdentifier = :status AND diff = 14

With

WHERE pt.slug != :paymentSlug AND s.keyIdentifier = :status

It works perfectly and displays me correct record, i also tried following WHERE condition

WHERE pt.slug != :paymentSlug AND s.keyIdentifier = :status AND DATE_DIFF(MAX(ps.dueDate), CURRENT_DATE()) = :days_diff

WHERE pt.slug != :paymentSlug AND s.keyIdentifier = :status HAVING (DATE_DIFF(MAX(ps.dueDate), CURRENT_DATE())) = :days_diff

Above WHERE does not work as well, what am i missing here ?

Thanks.

Answer 1

If you want to use the alias in your WHERE clause you need a sub-select .

select *
from 
(SELECT
    p0_.id AS id_0,
    MAX(p0_.due_date) AS sclr_1,
    u1_.first_name AS first_name_2,
    u1_.last_name AS last_name_3,
    u1_.email AS email_4,
    p0_.loan_application_id AS sclr_5,
    DATEDIFF(MAX(p0_.due_date), CURRENT_DATE) AS sclr_6 
FROM
    payment_schedule p0_
LEFT JOIN
    payment_type p2_ ON p0_.payment_type_id = p2_.id
LEFT JOIN
    loan_application l3_ ON p0_.loan_application_id = l3_.id
LEFT JOIN 
    loan_application_status l4_ ON l3_.loan_application_status_id = l4_.id
LEFT JOIN
    user u1_ ON l3_.user_id = u1_.id
) A
WHERE
    slug <> ? AND key_identifier = ? AND sclr_6 = 14

This is how query is logically processed

FROM clause
WHERE clause
SELECT clause
GROUP BY clause
HAVING clause
ORDER BY clause

Since Where comes before Select you cannot use alias name in Where clause

Answer 2

You cannot use an alias (on the final result fields) in the WHERE clause; however, at least with MySQL, you may use a HAVING clause without needing a GROUP BY .

Answer 3

The expression you are using is the result of an aggregation. Replace add a having clause so the query looks like;

SELECT . . .
WHERE p2_.slug <> ? AND l4_.key_identifier = ? 
GROUP BY p0_.loan_application_id
HAVING sclr_6 = 14

Note that date_diff() is not a function in MySQL. You intend datediff() .