{"id":1630,"date":"2011-03-24T01:21:38","date_gmt":"2011-03-24T01:21:38","guid":{"rendered":"http:\/\/enjoyasp.net\/?p=1630"},"modified":"2011-07-18T03:44:30","modified_gmt":"2011-07-18T03:44:30","slug":"%e4%b8%ba%e5%88%97%e5%80%bc%e6%8c%87%e5%ae%9a%e7%94%9f%e6%88%90%e6%96%b9%e5%bc%8f%e5%a6%82%e7%94%a8checksum","status":"publish","type":"post","link":"https:\/\/enjoyasp.net\/index.php\/2011\/03\/24\/%e4%b8%ba%e5%88%97%e5%80%bc%e6%8c%87%e5%ae%9a%e7%94%9f%e6%88%90%e6%96%b9%e5%bc%8f%e5%a6%82%e7%94%a8checksum\/","title":{"rendered":"\u4e3a\u5217\u503c\u6307\u5b9a\u751f\u6210\u65b9\u5f0f\u5982\u7528checksum"},"content":{"rendered":"<p>\u8868\u8bbe\u8ba1\u4e2d\u589e\u52a0\u5217\uff0c\u5728\u5217\u7684\u8ba1\u7b97\u6240\u5f97\u5217\u7684\u89c4\u8303\u4e2d\u5f55\u5165\u516c\u5f0f\u5373\u53ef<br \/>\n\u6301\u4e45\u4ee3\u8868\u503c\u662f\u5426\u5b9e\u9645\u5b58\u50a8\u8d77\u6765\u8fd8\u662f\u6bcf\u6b21\u67e5\u8be2\u65f6\u91cd\u65b0\u751f\u6210<br \/>\n\u5982\uff1aALTER TABLE dbo.tmp ADD cs_Pname AS CHECKSUM(c1);<br \/>\n\u4e3a\u5217\u8ba1\u7b97\u6821\u9a8c\u503c\uff0c\u7136\u540e\u5728\u6b64\u5217\u4e0a\u52a0\u4e0a\u7d22\u5f15\uff0c\u5219\u6bd4\u4e00\u822c\u7684\u67e5\u8be2\u901f\u5ea6\u8981\u5feb<br \/>\n\u5e94\u7528\uff1a1,\u5b57\u7b26\u4e32\u6bd4\u8f83\u6ca1\u6709\u6570\u5b57\u6bd4\u8f83\u6765\u5f97\u5feb\uff0c\u6545\u53ef\u589e\u52a0\u4e00\u5217\u5b58\u5b57\u7b26\u4e32\u7684\u6821\u9a8c\u503c\uff0c\u5728\u6b64\u503c\u4e0a\u52a0\u7d22\u5f15\u8fdb\u884c\u6bd4\u8f83\uff0c\u901f\u5ea6\u5c06\u63d0\u5347\u5f88\u591a<\/p>\n<p>2,SELECT CHECKSUM(NEWID()) \u8fd4\u56de\u968f\u673a\u65701\u5230n\uff1a abs(CHECKSUM(NEWID()))%n + 1<\/p>\n<p>3,CHECKSUM(NEWID())  \u8fd4\u56de8-10\u4f4d\u6570\u5b57\uff0c\u6545\u8981\u6c4211\u4f4d\u4ee5\u4e0a\u7684\u968f\u673a\u4e0d\u91cd\u590d\u6570\uff0c\u53ef\u91c7\u7528\uff1a<br \/>\nSELECT right(right(abs(CHECKSUM(NEWID())),3) + CONVERT(varchar(50),abs(CHECKSUM(NEWID()))),11)<\/p>\n<p>4,\u968f\u673a\u65f6\u95f4\uff1a<br \/>\nSELECT DATEADD(mi,ABS(CHECKSUM(NEWID())%(1+DATEDIFF(mi,&#8217;2011-05-14 13:00&#8242;,&#8217;2011-05-14 14:00&#8242;))),&#8217;2011-05-14 13:00&#8242;)<\/p>\n<p>5,\u6bd4\u8f83\u4e24\u884c\u591a\u4e2a\u5217\u662f\u5426\u76f8\u540c<br \/>\nSELECT CHECKSUM(1,2,4)<br \/>\nSELECT DISTINCT OBJECT_ID,NAME,TYPE<br \/>\nFROM sys.tables tb<br \/>\nWHERE CHECKSUM(OBJECT_ID,NAME,type)<br \/>\nIN(<br \/>\n    SELECT CHECKSUM(OBJECT_ID,NAME,type)<br \/>\n    FROM (<br \/>\n        SELECT OBJECT_ID,NAME,TYPE FROM sys.objects o<br \/>\n    )obj<br \/>\n)<br \/>\n\u6ce8\uff1a checksum\u4e0d\u533a\u5206\u5927\u5c0f\u5199\uff0c\u82e5\u8981\u533a\u5206\uff0c\u8981\u7528BINARY_CHECKSUM<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8868\u8bbe\u8ba1\u4e2d\u589e\u52a0\u5217\uff0c\u5728\u5217\u7684\u8ba1\u7b97\u6240\u5f97\u5217\u7684\u89c4\u8303\u4e2d\u5f55\u5165\u516c\u5f0f\u5373\u53ef \u6301\u4e45\u4ee3\u8868\u503c\u662f\u5426\u5b9e\u9645\u5b58\u50a8\u8d77\u6765\u8fd8\u662f\u6bcf\u6b21\u67e5\u8be2\u65f6\u91cd\u65b0\u751f\u6210 \u5982\uff1aA [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[],"class_list":["post-1630","post","type-post","status-publish","format-standard","hentry","category-sql-server"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts\/1630","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/comments?post=1630"}],"version-history":[{"count":0,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts\/1630\/revisions"}],"wp:attachment":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/media?parent=1630"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/categories?post=1630"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/tags?post=1630"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}