![\"\"](\"\/rizhi\/blog\/UploadFiles\/200810\/20081022a5o2oh.gif\")
<\/p>\n","protected":false},"excerpt":{"rendered":"\u901a\u5e38\uff0c\u4f60\u9700\u8981\u83b7\u5f97\u5f53\u524d\u65e5\u671f\u548c\u8ba1\u7b97\u4e00\u4e9b\u5176\u4ed6\u7684\u65e5\u671f\uff0c\u4f8b\u5982\uff0c\u4f60\u7684\u7a0b\u5e8f\u53ef\u80fd\u9700\u8981\u5224\u65ad\u4e00\u4e2a\u6708\u7684\u7b2c\u4e00\u5929\u6216\u8005\u6700\u540e\u4e00\u5929\u3002\u4f60\u4eec\u5927\u90e8\u5206\u4eba\u5927\u6982\u90fd\u77e5\u9053\u600e\u6837\u628a\u65e5\u671f\u8fdb\u884c\u5206\u5272\uff08\u5e74\u3001\u6708\u3001\u65e5\u7b49\uff09\uff0c\u7136\u540e\u4ec5\u4ec5\u7528\u5206\u5272\u51fa\u6765\u7684\u5e74\u3001\u6708\u3001\u65e5\u7b49\u653e\u5728\u51e0\u4e2a\u51fd\u6570\u4e2d\u8ba1\u7b97\u51fa\u81ea\u5df1\u6240\u9700\u8981\u7684\u65e5\u671f\uff01\u5728\u8fd9\u7bc7\u6587\u7ae0\u91cc\uff0c\u6211\u5c06\u544a\u8bc9\u4f60\u5982\u4f55\u4f7f\u7528DATEADD\u548cDATEDIFF\u51fd\u6570\u6765\u8ba1\u7b97\u51fa\u5728\u4f60\u7684\u7a0b\u5e8f\u4e2d\u53ef\u80fd\u4f60\u8981\u7528\u5230\u7684\u4e00\u4e9b\u4e0d\u540c\u65e5\u671f\u3002 <\/p>\n
\u5728\u4f7f\u7528\u672c\u6587\u4e2d\u7684\u4f8b\u5b50\u4e4b\u524d\uff0c\u4f60\u5fc5\u987b\u6ce8\u610f\u4ee5\u4e0b\u7684\u95ee\u9898\u3002\u5927\u90e8\u5206\u53ef\u80fd\u4e0d\u662f\u6240\u6709\u4f8b\u5b50\u5728\u4e0d\u540c\u7684\u673a\u5668\u4e0a\u6267\u884c\u7684\u7ed3\u679c\u53ef\u80fd\u4e0d\u4e00\u6837\uff0c\u8fd9\u5b8c\u5168\u7531\u54ea\u4e00\u5929\u662f\u4e00\u4e2a\u661f\u671f\u7684\u7b2c\u4e00\u5929\u8fd9\u4e2a\u8bbe\u7f6e\u51b3\u5b9a\u3002\u7b2c\u4e00\u5929\uff08DATEFIRST\uff09\u8bbe\u5b9a\u51b3\u5b9a\u4e86\u4f60\u7684\u7cfb\u7edf\u4f7f\u7528\u54ea\u4e00\u5929\u4f5c\u4e3a\u4e00\u5468\u7684\u7b2c\u4e00\u5929\u3002\u6240\u6709\u4ee5\u4e0b\u7684\u4f8b\u5b50\u90fd\u662f\u4ee5\u661f\u671f\u5929\u4f5c\u4e3a\u4e00\u5468\u7684\u7b2c\u4e00\u5929\u6765\u5efa\u7acb\uff0c\u4e5f\u5c31\u662f\u7b2c\u4e00\u5929\u8bbe\u7f6e\u4e3a7\u3002\u5047\u5982\u4f60\u7684\u7b2c\u4e00\u5929\u8bbe\u7f6e\u4e0d\u4e00\u6837\uff0c\u4f60\u53ef\u80fd\u9700\u8981\u8c03\u6574\u8fd9\u4e9b\u4f8b\u5b50\uff0c\u4f7f\u5b83\u548c\u4e0d\u540c\u7684\u7b2c\u4e00\u5929\u8bbe\u7f6e\u76f8\u7b26\u5408\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7@@DATEFIRST\u51fd\u6570\u6765\u68c0\u67e5\u7b2c\u4e00\u5929\u8bbe\u7f6e\u3002<\/p>\n
\u4e3a\u4e86\u7406\u89e3\u8fd9\u4e9b\u4f8b\u5b50\uff0c\u6211\u4eec\u5148\u590d\u4e60\u4e00\u4e0bDATEDIFF\u548cDATEADD\u51fd\u6570\u3002DATEDIFF\u51fd\u6570\u8ba1\u7b97\u4e24\u4e2a\u65e5\u671f\u4e4b\u95f4\u7684\u5c0f\u65f6\u3001\u5929\u3001\u5468\u3001\u6708\u3001\u5e74\u7b49\u65f6\u95f4\u95f4\u9694\u603b\u6570\u3002DATEADD\u51fd\u6570\u8ba1\u7b97\u4e00\u4e2a\u65e5\u671f\u901a\u8fc7\u7ed9\u65f6\u95f4\u95f4\u9694\u52a0\u51cf\u6765\u83b7\u5f97\u4e00\u4e2a\u65b0\u7684\u65e5\u671f\u3002\u8981\u4e86\u89e3\u66f4\u591a\u7684DATEDIFF\u548cDATEADD\u51fd\u6570\u4ee5\u53ca\u65f6\u95f4\u95f4\u9694\u53ef\u4ee5\u9605\u8bfb\u5fae\u8f6f\u8054\u673a\u5e2e\u52a9\u3002<\/p>\n
\u4f7f\u7528DATEDIFF\u548cDATEADD\u51fd\u6570\u6765\u8ba1\u7b97\u65e5\u671f\uff0c\u548c\u672c\u6765\u4ece\u5f53\u524d\u65e5\u671f\u8f6c\u6362\u5230\u4f60\u9700\u8981\u7684\u65e5\u671f\u7684\u8003\u8651\u65b9\u6cd5\u6709\u70b9\u4e0d\u540c\u3002\u4f60\u5fc5\u987b\u4ece\u65f6\u95f4\u95f4\u9694\u8fd9\u4e2a\u65b9\u9762\u6765\u8003\u8651\u3002\u6bd4\u5982\uff0c\u4ece\u5f53\u524d\u65e5\u671f\u5230\u4f60\u8981\u5f97\u5230\u7684\u65e5\u671f\u4e4b\u95f4\u6709\u591a\u5c11\u65f6\u95f4\u95f4\u9694\uff0c\u6216\u8005\uff0c\u4ece\u4eca\u5929\u5230\u67d0\u4e00\u5929\uff08\u6bd4\u59821900-1-1\uff09\u4e4b\u95f4\u6709\u591a\u5c11\u65f6\u95f4\u95f4\u9694\uff0c\u7b49\u7b49\u3002\u7406\u89e3\u600e\u6837\u7740\u773c\u4e8e\u65f6\u95f4\u95f4\u9694\u6709\u52a9\u4e8e\u4f60\u8f7b\u677e\u7684\u7406\u89e3\u6211\u7684\u4e0d\u540c\u7684\u65e5\u671f\u8ba1\u7b97\u4f8b\u5b50\u3002<\/p>\n
\u4e00\u4e2a\u6708\u7684\u7b2c\u4e00\u5929<\/p>\n
\u7b2c\u4e00\u4e2a\u4f8b\u5b50\uff0c\u6211\u5c06\u544a\u8bc9\u4f60\u5982\u4f55\u4ece\u5f53\u524d\u65e5\u671f\u53bb\u8fd9\u4e2a\u6708\u7684\u6700\u540e\u4e00\u5929\u3002\u8bf7\u6ce8\u610f\uff1a\u8fd9\u4e2a\u4f8b\u5b50\u4ee5\u53ca\u8fd9\u7bc7\u6587\u7ae0\u4e2d\u7684\u5176\u4ed6\u4f8b\u5b50\u90fd\u5c06\u53ea\u4f7f\u7528DATEDIFF\u548cDATEADD\u51fd\u6570\u6765\u8ba1\u7b97\u6211\u4eec\u60f3\u8981\u7684\u65e5\u671f\u3002\u6bcf\u4e00\u4e2a\u4f8b\u5b50\u90fd\u5c06\u901a\u8fc7\u8ba1\u7b97\u4f46\u524d\u7684\u65f6\u95f4\u95f4\u9694\uff0c\u7136\u540e\u8fdb\u884c\u52a0\u51cf\u6765\u5f97\u5230\u60f3\u8981\u8ba1\u7b97\u7684\u65e5\u671f\u3002<\/p>\n
\u8fd9\u662f\u8ba1\u7b97\u4e00\u4e2a\u6708\u7b2c\u4e00\u5929\u7684SQL \u811a\u672c\uff1a<\/p>\n
SELECT DATEADD(mm, DATEDIFF(mm,0,getdate()), 0)<\/p>\n
\u6211\u4eec\u628a\u8fd9\u4e2a\u8bed\u53e5\u5206\u5f00\u6765\u770b\u770b\u5b83\u662f\u5982\u4f55\u5de5\u4f5c\u7684\u3002\u6700\u6838\u5fc3\u7684\u51fd\u6570\u662fgetdate()\uff0c\u5927\u90e8\u5206\u4eba\u90fd\u77e5\u9053\u8fd9\u4e2a\u662f\u8fd4\u56de\u5f53\u524d\u7684\u65e5\u671f\u548c\u65f6\u95f4\u7684\u51fd\u6570\u3002\u4e0b\u4e00\u4e2a\u6267\u884c\u7684\u51fd\u6570DATEDIFF(mm,0,getdate())\u662f\u8ba1\u7b97\u5f53\u524d\u65e5\u671f\u548c“1900-01-01 00:00:00.000”\u8fd9\u4e2a\u65e5\u671f\u4e4b\u95f4\u7684\u6708\u6570\u3002\u8bb0\u4f4f\uff1a\u65f6\u671f\u548c\u65f6\u95f4\u53d8\u91cf\u548c\u6beb\u79d2\u4e00\u6837\u662f\u4ece“1900-01-01 00:00:00.000”\u5f00\u59cb\u8ba1\u7b97\u7684\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u4f60\u53ef\u4ee5\u5728DATEDIFF\u51fd\u6570\u4e2d\u6307\u5b9a\u7b2c\u4e00\u4e2a\u65f6\u95f4\u8868\u8fbe\u5f0f\u4e3a“0”\u3002\u4e0b\u4e00\u4e2a\u51fd\u6570\u662fDATEADD\uff0c\u589e\u52a0\u5f53\u524d\u65e5\u671f\u5230“1900-01-01”\u7684\u6708\u6570\u3002\u901a\u8fc7\u589e\u52a0\u9884\u5b9a\u4e49\u7684\u65e5\u671f“1900-01-01”\u548c\u5f53\u524d\u65e5\u671f\u7684\u6708\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u83b7\u5f97\u8fd9\u4e2a\u6708\u7684\u7b2c\u4e00\u5929\u3002\u53e6\u5916\uff0c\u8ba1\u7b97\u51fa\u6765\u7684\u65e5\u671f\u7684\u65f6\u95f4\u90e8\u5206\u5c06\u4f1a\u662f“00:00:00.000”\u3002<\/p>\n
\u8fd9\u4e2a\u8ba1\u7b97\u7684\u6280\u5de7\u662f\u5148\u8ba1\u7b97\u5f53\u524d\u65e5\u671f\u5230“1900-01-01”\u7684\u65f6\u95f4\u95f4\u9694\u6570\uff0c\u7136\u540e\u628a\u5b83\u52a0\u5230“1900-01-01”\u4e0a\u6765\u83b7\u5f97\u7279\u6b8a\u7684\u65e5\u671f\uff0c\u8fd9\u4e2a\u6280\u5de7\u53ef\u4ee5\u7528\u6765\u8ba1\u7b97\u5f88\u591a\u4e0d\u540c\u7684\u65e5\u671f\u3002\u4e0b\u4e00\u4e2a\u4f8b\u5b50\u4e5f\u662f\u7528\u8fd9\u4e2a\u6280\u5de7\u4ece\u5f53\u524d\u65e5\u671f\u6765\u4ea7\u751f\u4e0d\u540c\u7684\u65e5\u671f\u3002<\/p>\n
\u672c\u5468\u7684\u661f\u671f\u4e00<\/p>\n
\u8fd9\u91cc\u6211\u662f\u7528\u5468(wk)\u7684\u65f6\u95f4\u95f4\u9694\u6765\u8ba1\u7b97\u54ea\u4e00\u5929\u662f\u672c\u5468\u7684\u661f\u671f\u4e00\u3002<\/p>\n
SELECT DATEADD(wk, DATEDIFF(wk,0,getdate()), 0)<\/p>\n
\u4e00\u5e74\u7684\u7b2c\u4e00\u5929<\/p>\n
\u73b0\u5728\u7528\u5e74(yy)\u7684\u65f6\u95f4\u95f4\u9694\u6765\u663e\u793a\u8fd9\u4e00\u5e74\u7684\u7b2c\u4e00\u5929\u3002<\/p>\n
SELECT DATEADD(yy, DATEDIFF(yy,0,getdate()), 0)<\/p>\n
\u5b63\u5ea6\u7684\u7b2c\u4e00\u5929<\/p>\n
\u5047\u5982\u4f60\u8981\u8ba1\u7b97\u8fd9\u4e2a\u5b63\u5ea6\u7684\u7b2c\u4e00\u5929\uff0c\u8fd9\u4e2a\u4f8b\u5b50\u544a\u8bc9\u4f60\u8be5\u5982\u4f55\u505a\u3002<\/p>\n
SELECT DATEADD(qq, DATEDIFF(qq,0,getdate()), 0)<\/p>\n
\u5f53\u5929\u7684\u534a\u591c<\/p>\n
\u66fe\u7ecf\u9700\u8981\u901a\u8fc7getdate()\u51fd\u6570\u4e3a\u4e86\u8fd4\u56de\u65f6\u95f4\u503c\u622a\u6389\u65f6\u95f4\u90e8\u5206\uff0c\u5c31\u4f1a\u8003\u8651\u5230\u5f53\u524d\u65e5\u671f\u662f\u4e0d\u662f\u5728\u534a\u591c\u3002\u5047\u5982\u8fd9\u6837\uff0c\u8fd9\u4e2a\u4f8b\u5b50\u4f7f\u7528DATEDIFF\u548cDATEADD\u51fd\u6570\u6765\u83b7\u5f97\u534a\u591c\u7684\u65f6\u95f4\u70b9\u3002<\/p>\n
SELECT DATEADD(dd, DATEDIFF(dd,0,getdate()), 0)<\/p>\n
\u6df1\u5165DATEDIFF\u548cDATEADD\u51fd\u6570\u8ba1\u7b97<\/p>\n
\u4f60\u53ef\u4ee5\u660e\u767d\uff0c\u901a\u8fc7\u4f7f\u7528\u7b80\u5355\u7684DATEDIFF\u548cDATEADD\u51fd\u6570\u8ba1\u7b97\uff0c\u4f60\u53ef\u4ee5\u53d1\u73b0\u5f88\u591a\u4e0d\u540c\u7684\u53ef\u80fd\u6709\u610f\u4e49\u7684\u65e5\u671f\u3002<\/p>\n
\u76ee\u524d\u4e3a\u6b62\u7684\u6240\u6709\u4f8b\u5b50\u53ea\u662f\u4ec5\u4ec5\u8ba1\u7b97\u5f53\u524d\u7684\u65f6\u95f4\u548c“1900-01-01”\u4e4b\u95f4\u7684\u65f6\u95f4\u95f4\u9694\u6570\u91cf\uff0c\u7136\u540e\u628a\u5b83\u52a0\u5230“1900-01-01”\u7684\u65f6\u95f4\u95f4\u9694\u4e0a\u6765\u8ba1\u7b97\u51fa\u65e5\u671f\u3002\u5047\u5b9a\u4f60\u4fee\u6539\u65f6\u95f4\u95f4\u9694\u7684\u6570\u91cf\uff0c\u6216\u8005\u4f7f\u7528\u4e0d\u540c\u7684\u65f6\u95f4\u95f4\u9694\u6765\u8c03\u7528DATEADD\u51fd\u6570\uff0c\u6216\u8005\u51cf\u53bb\u65f6\u95f4\u95f4\u9694\u800c\u4e0d\u662f\u589e\u52a0\uff0c\u90a3\u4e48\u901a\u8fc7\u8fd9\u4e9b\u5c0f\u7684\u8c03\u6574\u4f60\u53ef\u4ee5\u53d1\u73b0\u548c\u591a\u4e0d\u540c\u7684\u65e5\u671f\u3002<\/p>\n
\u8fd9\u91cc\u6709\u56db\u4e2a\u4f8b\u5b50\u4f7f\u7528\u53e6\u5916\u4e00\u4e2aDATEADD\u51fd\u6570\u6765\u8ba1\u7b97\u6700\u540e\u4e00\u5929\u6765\u5206\u522b\u66ff\u6362DATEADD\u51fd\u6570\u524d\u540e\u4e24\u4e2a\u65f6\u95f4\u95f4\u9694\u3002<\/p>\n
\u4e0a\u4e2a\u6708\u7684\u6700\u540e\u4e00\u5929<\/p>\n
\u8fd9\u662f\u4e00\u4e2a\u8ba1\u7b97\u4e0a\u4e2a\u6708\u6700\u540e\u4e00\u5929\u7684\u4f8b\u5b50\u3002\u5b83\u901a\u8fc7\u4ece\u4e00\u4e2a\u6708\u7684\u6700\u540e\u4e00\u5929\u8fd9\u4e2a\u4f8b\u5b50\u4e0a\u51cf\u53bb3\u6beb\u79d2\u6765\u83b7\u5f97\u3002\u6709\u4e00\u70b9\u8981\u8bb0\u4f4f\uff0c\u5728Sql Server\u4e2d\u65f6\u95f4\u662f\u7cbe\u786e\u52303\u6beb\u79d2\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u6211\u9700\u8981\u51cf\u53bb3\u6beb\u79d2\u6765\u83b7\u5f97\u6211\u8981\u7684\u65e5\u671f\u548c\u65f6\u95f4\u3002<\/p>\n
SELECT dateadd(ms,-3,DATEADD(mm, DATEDIFF(mm,0,getdate()), 0))<\/p>\n
\u8ba1\u7b97\u51fa\u6765\u7684\u65e5\u671f\u7684\u65f6\u95f4\u90e8\u5206\u5305\u542b\u4e86\u4e00\u4e2aSql Server\u53ef\u4ee5\u8bb0\u5f55\u7684\u4e00\u5929\u7684\u6700\u540e\u65f6\u523b(“23:59:59:997”)\u7684\u65f6\u95f4\u3002<\/p>\n
\u53bb\u5e74\u7684\u6700\u540e\u4e00\u5929<\/p>\n
\u8fde\u63a5\u4e0a\u9762\u7684\u4f8b\u5b50\uff0c\u4e3a\u4e86\u8981\u5f97\u5230\u53bb\u5e74\u7684\u6700\u540e\u4e00\u5929\uff0c\u4f60\u9700\u8981\u5728\u4eca\u5e74\u7684\u7b2c\u4e00\u5929\u4e0a\u51cf\u53bb3\u6beb\u79d2\u3002<\/p>\n
SELECT dateadd(ms,-3,DATEADD(yy, DATEDIFF(yy,0,getdate()), 0))<\/p>\n
\u672c\u6708\u7684\u6700\u540e\u4e00\u5929<\/p>\n
\u73b0\u5728\uff0c\u4e3a\u4e86\u83b7\u5f97\u672c\u6708\u7684\u6700\u540e\u4e00\u5929\uff0c\u6211\u9700\u8981\u7a0d\u5fae\u4fee\u6539\u4e00\u4e0b\u83b7\u5f97\u4e0a\u4e2a\u6708\u7684\u6700\u540e\u4e00\u5929\u7684\u8bed\u53e5\u3002\u4fee\u6539\u9700\u8981\u7ed9\u7528DATEDIFF\u6bd4\u8f83\u5f53\u524d\u65e5\u671f\u548c“1900-01-01”\u8fd4\u56de\u7684\u65f6\u95f4\u95f4\u9694\u4e0a\u52a01\u3002\u901a\u8fc7\u52a01\u4e2a\u6708\uff0c\u6211\u8ba1\u7b97\u51fa\u4e0b\u4e2a\u6708\u7684\u7b2c\u4e00\u5929\uff0c\u7136\u540e\u51cf\u53bb3\u6beb\u79d2\uff0c\u8fd9\u6837\u5c31\u8ba1\u7b97\u51fa\u4e86\u8fd9\u4e2a\u6708\u7684\u6700\u540e\u4e00\u5929\u3002\u8fd9\u662f\u8ba1\u7b97\u672c\u6708\u6700\u540e\u4e00\u5929\u7684SQL\u811a\u672c\u3002<\/p>\n
SELECT dateadd(ms,-3,DATEADD(mm, DATEDIFF(m,0,getdate())+1, 0))<\/p>\n
\u672c\u5e74\u7684\u6700\u540e\u4e00\u5929<\/p>\n
\u4f60\u73b0\u5728\u5e94\u8be5\u638c\u63e1\u8fd9\u4e2a\u7684\u505a\u6cd5\uff0c\u8fd9\u662f\u8ba1\u7b97\u672c\u5e74\u6700\u540e\u4e00\u5929\u811a\u672c<\/p>\n
SELECT dateadd(ms,-3,DATEADD(yy, DATEDIFF(yy,0,getdate())+1, 0))\u3002<\/p>\n
\u672c\u6708\u7684\u7b2c\u4e00\u4e2a\u661f\u671f\u4e00<\/p>\n
\u597d\u4e86\uff0c\u73b0\u5728\u662f\u6700\u540e\u4e00\u4e2a\u4f8b\u5b50\u3002\u8fd9\u91cc\u6211\u8981\u8ba1\u7b97\u8fd9\u4e2a\u6708\u7684\u7b2c\u4e00\u4e2a\u661f\u671f\u4e00\u3002\u8fd9\u662f\u8ba1\u7b97\u7684\u811a\u672c\u3002<\/p>\n
\u3000select DATEADD(wk, DATEDIFF(wk,0,<\/p>\n
dateadd(dd,6-datepart(day,getdate()),getdate())<\/p>\n
), 0) <\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u91cc\uff0c\u6211\u4f7f\u7528\u4e86“\u672c\u5468\u7684\u661f\u671f\u4e00”\u7684\u811a\u672c\uff0c\u5e76\u4f5c\u4e86\u4e00\u70b9\u70b9\u4fee\u6539\u3002\u4fee\u6539\u7684\u90e8\u5206\u662f\u628a\u539f\u6765\u811a\u672c\u4e2d“getdate()”\u90e8\u5206\u66ff\u6362\u6210\u8ba1\u7b97\u672c\u6708\u7684\u7b2c6\u5929\uff0c\u5728\u8ba1\u7b97\u4e2d\u7528\u672c\u6708\u7684\u7b2c6\u5929\u6765\u66ff\u6362\u5f53\u524d\u65e5\u671f\u4f7f\u5f97\u8ba1\u7b97\u53ef\u4ee5\u83b7\u5f97\u8fd9\u4e2a\u6708\u7684\u7b2c\u4e00\u4e2a\u661f\u671f\u4e00\u3002<\/p>\n
\u603b\u7ed3<\/p>\n
\u6211\u5e0c\u671b\u8fd9\u4e9b\u4f8b\u5b50\u53ef\u4ee5\u5728\u4f60\u7528DATEADD\u548cDATEDIFF\u51fd\u6570\u8ba1\u7b97\u65e5\u671f\u65f6\u7ed9\u4f60\u4e00\u70b9\u542f\u53d1\u3002\u901a\u8fc7\u4f7f\u7528\u8fd9\u4e2a\u8ba1\u7b97\u65e5\u671f\u7684\u65f6\u95f4\u95f4\u9694\u7684\u6570\u5b66\u65b9\u6cd5\uff0c\u6211\u53d1\u73b0\u4e3a\u4e86\u663e\u793a\u4e24\u4e2a\u65e5\u671f\u4e4b\u95f4\u95f4\u9694\u7684\u6709\u7528\u5386\u6cd5\u662f\u6709\u4ef7\u503c\u7684\u3002\u6ce8\u610f\uff0c\u8fd9\u53ea\u662f\u8ba1\u7b97\u51fa\u8fd9\u4e9b\u65e5\u671f\u7684\u4e00\u79cd\u65b9\u6cd5\u3002\u8981\u7262\u8bb0\uff0c\u8fd8\u6709\u5f88\u591a\u65b9\u6cd5\u53ef\u4ee5\u5f97\u5230\u76f8\u540c\u7684\u8ba1\u7b97\u7ed3\u679c\u3002\u5047\u5982\u4f60\u6709\u5176\u4ed6\u7684\u65b9\u6cd5\uff0c\u90a3\u5f88\u4e0d\u9519\uff0c\u8981\u662f\u4f60\u6ca1\u6709\uff0c\u6211\u5e0c\u671b\u8fd9\u4e9b\u4f8b\u5b50\u53ef\u4ee5\u7ed9\u4f60\u4e00\u4e9b\u542f\u53d1\uff0c\u5f53\u4f60\u8981\u7528DATEADD\u548cDATEDIFF\u51fd\u6570\u8ba1\u7b97\u4f60\u7a0b\u5e8f\u53ef\u80fd\u8981\u7528\u5230\u7684\u65e5\u671f\u65f6\u3002 <\/p>\n
\u9644\u5f55\uff1a\u5176\u4ed6\u65e5\u671f\u5904\u7406\u65b9\u6cd5<\/p>\n
1)\u53bb\u6389\u65f6\u5206\u79d2<\/p>\n
declare @ datetime<\/p>\n
set @ = getdate() –‘2003-7-1 10:00:00’<\/p>\n
SELECT @,DATEADD(day, DATEDIFF(day,0,@), 0) <\/p>\n
\u3000<\/p>\n
2\uff09\u663e\u793a\u661f\u671f\u51e0<\/p>\n
select datename(weekday,getdate()) <\/p>\n
\n3\uff09\u5982\u4f55\u53d6\u5f97\u67d0\u4e2a\u6708\u7684\u5929\u6570<\/p>\n
declare @m int<\/p>\n
set @m=2 –\u6708\u4efd<\/p>\n
select datediff(day,’2003-‘+cast(@m as varchar)+’-15′ ,’2003-‘+cast(@m+1 as varchar)+’-15′)<\/p>\n
\u53e6\u5916\uff0c\u53d6\u5f97\u672c\u6708\u5929\u6570<\/p>\n
select datediff(day,cast(month(GetDate()) as varchar)+’-‘+cast(month(GetDate()) as varchar)+’-15′ ,cast(month(GetDate()) as varchar)+’-‘+cast(month(GetDate())+1 as varchar)+’-15′)<\/p>\n
\u6216\u8005\u4f7f\u7528\u8ba1\u7b97\u672c\u6708\u7684\u6700\u540e\u4e00\u5929\u7684\u811a\u672c\uff0c\u7136\u540e\u7528DAY\u51fd\u6570\u533a\u6700\u540e\u4e00\u5929<\/p>\n
SELECT Day(dateadd(ms,-3,DATEADD(mm, DATEDIFF(m,0,getdate())+1, 0))) <\/p>\n
4\uff09\u5224\u65ad\u662f\u5426\u95f0\u5e74\uff1a<\/p>\n
SELECT case day(dateadd(mm, 2, dateadd(ms,-3,DATEADD(yy, DATEDIFF(yy,0,getdate()), 0)))) when 28 then ‘\u5e73\u5e74’ else ‘\u95f0\u5e74’ end<\/p>\n
\u6216\u8005<\/p>\n
select case datediff(day,datename(year,getdate())+’-02-01′,dateadd(mm,1,datename(year,getdate())+’-02-01′))<\/p>\n
when 28 then ‘\u5e73\u5e74’ else ‘\u95f0\u5e74’ end <\/p>\n
5\uff09\u4e00\u4e2a\u5b63\u5ea6\u591a\u5c11\u5929<\/p>\n
\ndeclare @m tinyint,@time smalldatetime<\/p>\n
select @m=month(getdate())<\/p>\n
select @m=case when @m between 1 and 3 then 1<\/p>\n
when @m between 4 and 6 then 4<\/p>\n
when @m between 7 and 9 then 7<\/p>\n
else 10 end<\/p>\n
select @time=datename(year,getdate())+’-‘+convert(varchar(10),@m)+’-01′<\/p>\n
select datediff(day,@time,dateadd(mm,3,@time))<\/p>\n","protected":false},"excerpt":{"rendered":"
\u901a\u5e38\uff0c\u4f60\u9700\u8981\u83b7\u5f97\u5f53\u524d\u65e5\u671f\u548c\u8ba1\u7b97\u4e00\u4e9b\u5176\u4ed6\u7684\u65e5\u671f\uff0c\u4f8b\u5982\uff0c\u4f60\u7684\u7a0b\u5e8f\u53ef\u80fd\u9700\u8981\u5224\u65ad\u4e00\u4e2a\u6708\u7684\u7b2c\u4e00\u5929\u6216\u8005\u6700\u540e\u4e00\u5929\u3002\u4f60\u4eec\u5927\u90e8\u5206\u4eba\u5927\u6982\u90fd\u77e5\u9053\u600e\u6837\u628a\u65e5\u671f\u8fdb\u884c\u5206\u5272\uff08\u5e74\u3001\u6708\u3001\u65e5\u7b49\uff09\uff0c\u7136\u540e\u4ec5\u4ec5\u7528\u5206\u5272\u51fa\u6765\u7684\u5e74\u3001\u6708\u3001\u65e5\u7b49\u653e\u5728\u51e0\u4e2a\u51fd\u6570\u4e2d\u8ba1\u7b97\u51fa\u81ea\u5df1\u6240\u9700\u8981\u7684\u65e5\u671f\uff01\u5728\u8fd9\u7bc7\u6587\u7ae0\u91cc…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"topic":[],"class_list":["post-5","post","type-post","status-publish","format-standard","hentry","category-technology"],"_links":{"self":[{"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/posts\/5","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/comments?post=5"}],"version-history":[{"count":1,"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/posts\/5\/revisions"}],"predecessor-version":[{"id":65573,"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/posts\/5\/revisions\/65573"}],"wp:attachment":[{"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/media?parent=5"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/categories?post=5"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/tags?post=5"},{"taxonomy":"topic","embeddable":true,"href":"http:\/\/www.xiaoyebailong.com\/index.php\/wp-json\/wp\/v2\/topic?post=5"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}