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SQLServer Execpt和not in 性能區(qū)別_MsSql_腳本之家
CPU 時間 = 0 毫秒,占用時間 = 0 毫秒。 結(jié)論:通過較多數(shù)據(jù) 和 較少數(shù)據(jù)的測試,在較少數(shù)據(jù)的情況下 not in 比 except 性能好,但是在較多數(shù)據(jù)情況下 execpt 比 not in 出色。 看執(zhí)行計劃可以得知 如何 在 tb1 和tb2 上建立索引,那么except 的執(zhí)行計劃開可以得到優(yōu)化。 如果大家有興趣可以看看 no
www.dbjr.com.cn/article/295...htm 2025-5-25
9. 類 Classes
Note that if the except clauses were reversed (with "except B" first), it would have printed B, B, B -- the first matching except clause is triggered. 要注意的是如果異常子句的順序顛倒過來( "execpt B" 在最前),它就會打印B,B,B--第一個匹配的異常被觸發(fā)。 When an error message is pr...
www.dbjr.com.cn/shouce/python/python_cn... 2025-6-3
Django之提交表單與前后端交互的方法_python_腳本之家
(2) 采用try/execpt語句防止阻塞程序 def ua_display_2(request): try: info = request.META['HTTP_USER_AGENT'] except KeyError: info = 'unknown' return HttpResponse("Your browser is %s" % info) (3) 想要看META中具體有哪些數(shù)據(jù),采用python字典獲取鍵值items方法 values = request.META.items() in...
www.dbjr.com.cn/article/1657...htm 2025-5-26
在html頁面中包含共享頁面的方法_javascript技巧_腳本之家
This works just like the earlier example execpt that b.js will get loaded from example.com rather than your own server. Similarly, PHP also "just works": <? readfile("http://example.com/b.inc"); ?> Unfortunately Apache SSI directives do not support remote includes. But there's almo...
www.dbjr.com.cn/article/162...htm 2025-6-7