CODEWITHSUNDEEP
mysqlsqlcoalesce
user1615559
user1615559

Reputation: 383

Select a default value if returned result is NULL in MySQL

The following query runs fine, but I want to input the option that if the email returned is NULL, then I input "[email protected]" or something similar. I have read up on a few functions to do so, like COALESCE(EMAIL,"[email protected]"), but I am unsure on the placement of that function in the script. Can you please direct me as to where I should inject that function and if I am even going at this in the right direction? Thanks you.

SELECT LCASE(LOGIN_NAME) as uniqueid, CONCAT('sha-512:', PASSWD) as password, REPLACE(CONTACT_NAME, '"', '') as name, \
     CONCAT('unit,', \
       MAX(CASE WHEN USER_TYPE = 'custom' THEN  \
          'location_employee'  \
        WHEN (LOGIN_NAME != 'link' AND USER_TYPE = 'owner' AND (UA.PARTY_SITE_ID IS NULL OR NOT EXISTS (SELECT U2.ID FROM CUSTOMER_DATA.USER_ACCESS U2 WHERE U2.USER_ID=U.ID AND (U2.PARTY_SITE_ID IS NULL OR U2.PARTY_SITE_ID = '')) ) )THEN  \
          'master'  \
        ELSE  \
          'location'  \
        END)) AS role, \
     MAX(EMAIL) as email, \
     MAX(PHONE) as phone, \
     MAX(FAX) as fax \
     FROM ORACLE_EXPORTS.SHIP_TO ST, \
     CUSTOMER_DATA.USER U \
     JOIN CUSTOMER_DATA.USER_ACCESS UA ON U.ID = UA.USER_ID \
     WHERE ( \
     (UA.PARTY_SITE_ID IS NULL AND ST.CUSTOMER_ID = UA.CUSTOMER_ID ) \
     OR \
     (ST.PARTY_SITE_ID IS NOT NULL AND ST.PARTY_SITE_ID = UA.PARTY_SITE_ID ) \
     ) \
     AND U.LOGIN_NAME IN ( ? ) \
     GROUP BY LOGIN_NAME

Upvotes: 20

Views: 42399

Answers (3)

konyak
konyak

Reputation: 11716

Use the MySQL's IFNULL function,

IFNULL(MAX(EMAIL), "[email protected]") as email

Upvotes: 42

Raphaël Althaus
Raphaël Althaus

Reputation: 60503

Well, where you try to get email ?

COALESCE(MAX(EMAIL), '[email protected]') as email

Upvotes: 20

Marc B
Marc B

Reputation: 360782

SELECT coalesce(field_or_derived_value_that_could_be_null, "new value here"), ...
FROM ...
WHERE ...

Upvotes: 3

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