MySql insert from one table to another where a field not null -

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i have table "phonebook" has 1.5m records, of records have "phonenumber" field empty.

i want copy records "phonenumber" field not empty table. due seems simple, cant work.

here code:

insert phonebook2 (company,zip,city,address,tags,phonetype,phonearea,phonenumber) select company,zip,city,address,tags,phonetype,phonearea,phonenumber phonebook phonenumber != null && phonenumber != "";

i dont error, "0 rows affected". in manual search on records, see null values phonenumber.

any suggestions ?

** have tried running same query without part , transfer records should.

use is not null instead of != null.

source: mysql manual


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