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if exists (select * from sysobjects where xtype='fn' and name='函数名')
print '存在函数xxx';
else
print '不存在函数xxx';
print '进行创建...';
if exists (select * from sysobjects where xtype='fn' and name='函数名')
print '存在函数xxx';
else
print '不存在函数xxx';
print '进行创建...';