ISNULL()与is null

is null
select * from 表名 where  字段名  is null;

ISNULL()
select * from 表名 where  ISNULL(字段名);

select * from fts_srv_dtr_f where  ISNULL(BRANCH_NAME);
select * from fts_srv_dtr_f where  BRANCH_NAME is null;