sql - Rotate columns to rows for joined tables -


i have 2 tables similar shown below (just leaving out fields simplicity).

table lead :

 id  |  fname    |   lname    |     email  ---------------------------------------------  1   |  john     |   doe      |    jd@test.com  2   |  mike     |   johnson  |    mj@test.com

table leadcustom :

 id   |   leadid     |    name         |    value  -------------------------------------------------  1    |   1          |    utm_medium   |    cpc  2    |   1          |    utm_term     |    fall  3    |   1          |    subject      |    business  4    |   2          |    utm_medium   |    display  5    |   2          |    utm_term     |    summer  6    |   2          |    month        |    may  7    |   2          |    color        |    red

i have database captures leads wide variety of forms have many different form fields. first table gets basic info know on each form. second table captures other forms fields sent on can contain lot of different fields.

what trying do join can grab fields lead table along utm_medium , utm_term leadcustom table. don't need additional fields if sent over.

desired results :

 id    |  fname    |    lname   |   email       |  utm_medium   |  utm_term  ---------------------------------------------------------------------------  1     |  john     |    doe     |   jd@test.com |  cpc          |  fall  2     |  mike     |    johnson |   mj@test.com |  display      |  summer

only way know grab lead data , each record make more calls leadcustom data looking know there has me more efficient way of getting data.

i appreciate , not can change way capture data , table formats.

if columns fixed, can group + case + max this:

select   fname,   lname,   email,   max(case when name = 'utm_medium' value end) utm_medium,   max(case when name = 'utm_term' value end) utm_term   lead l   join leadcustom c     on l.id = c.leadid group   fname,   lname,   email

the case assign value leadcustom table when matches given name, otherwise return null, , max pick take assigned value if exists on null.

you can test in sql fiddle

the other way use pivot operator, syntax more complex -- or @ least more easy me.


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