在mysql中删除null

Question

[ASK]

如何在mysql中删除null？

CREATE VIEW konsumenlist AS select 
(select nama_konsumen  where jenis_kelamin_konsumen="laki-laki" ) as Laki_laki,
(select nama_konsumen  where jenis_kelamin_konsumen="perempuan" ) as Perempuan  
from konsumen;
select * from konsumenlist;

Answer 1

如果我理解你，我认为这很容易。您需要使用IFNULL或COALESCE

CREATE VIEW konsumenlist AS select 
IFNULL((select nama_konsumen  where jenis_kelamin_konsumen="laki-laki" ),'---') as Laki_laki,
COALESCE((select nama_konsumen  where jenis_kelamin_konsumen="perempuan" ),'---') as Perempuan  
from konsumen;