1.选择最合适的字段属性:类型、⻓度、是否允许NULL等;尽量把字段设为not null,⼀⾯查询时对⽐是否为null; 2.要尽量避免全表扫描,⾸先应考虑在 where 及 order by 涉及的列上建⽴索引。 3.应尽量避免在 where ⼦句中对…
报错信息
#报错信息 Traceback (most recent call last): File “”, line 1, in File “C:\Python27\lib\site-packages\git_init_.py”, line 85, in raise ImportError(‘Failed to initialize: {0}’.format(exc)) ImportError: Failed to initialize: Bad git executab…