update 3 column in same time 2nd table all field varchar update help of phone number

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MySQL

database 1st nd user table
--db1.user

mobileNo | userId |emailId | dob

1111111111 | 1 | cve@gmail.com |30-12-2013
2222222222 | 2 | ehs@gmail.com |20-12-2012
5555555555 | 3 | hsdj@gmail.com |01-12-2013
6666666666 | 4 | tr@gmail.com |02-12-2010


database 2nd nd table customer
db2.customer

mobile No | userId | Email Id | Date of birth

1111111111 | null | null |null
2222222222 | null | null |null
3333333333 | null | null |null
7777777777 | null | null |null

i want update my db2.customer where phone number match all update userId ,Email Id ,Date of birth


my quarry not work---

UPDATE db2.customer e1
SET
(
e1.userId,
e1.Email Id,
e1.Date of birth
)=
(SELECT ur.userId,ur.emailId,ur.dob FROM db1.user ur WHERE db1.user.mobileNo=db2.customer.mobile NO )