Question

如何用SQL命令查询dbf数据库里面的姓名‘xm’字段是否有空的

Answer 1

select * from dbf where xm=""

你可以试试

Answer 2

TSQL: SELECT * FROM bdf WHERE xm = '' or xm is null

Answer 3

select * from dbf where xm is null

Answer 4

select * from dbf where xm is null or xm=''