Note that the database null

2010-10-11  来源:本站原创  分类:Database  人气:130 

Implementation of select * from gy_cc_kclsb where wzbm = '01-01-02-00-00-00-054 'after the results

Picture of a

Note that the database null

Implementation of select * from gy_cc_kclsb where wzbm = '01-01-02-00-00-00-054 'and dzbh! =' A '

Does not mean a null value but did not filter out

Figure II results do not rule out the empty fields

Note that the database null

So when Oracle query is best not to use! =, If use! =, Then to add and field is not null

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