尊龙凯时人生就是搏

oracleÖÐ×Ö·û´®ÀàÐ͵ÄÊý×ÖÔõôÅÌËã

ÔÚ oracle ÖУ¬×Ö·û´®ÀàÐ͵ÄÊý×Ö¿ÉÒÔͨ¹ý cast »ò to_number º¯Êýת»»ÎªÊý×Ö£¬Ö®ºó¼´¿É¾ÙÐÐÊýѧÔËË㡣ת»»Ê±Ðè×¢ÖØÈ·±£ËùÓÐ×Ö·û´®¶¼ÒÑת»»ÎªÊý×Ö£¬ÒÔ×èÖ¹¹ýʧ¡£oracle Ò²ÌṩÆäËûº¯Êý£¨Èç substr ºÍ instr£©À´²Ù×÷×Ö·û´®ÀàÐ͵ÄÊý×Ö¡£

ÔõÑùÔÚ Oracle ÖжÔ×Ö·û´®ÀàÐ͵ÄÊý×Ö¾ÙÐÐÅÌËã

Oracle Êý¾Ý¿âÖеÄ×Ö·û´®ÀàÐÍ¿ÉÒÔ´æ´¢Êý×ÖÖµ¡£¿ÉÊÇ£¬ÔÚ¾ÙÐÐÊýѧÔËËãʱ£¬ÕâЩ×Ö·û´®ÐèҪת»»ÎªÊý×ÖÀàÐÍ¡£

ת»»×Ö·û´®µ½Êý×Ö

ÓÐÁ½ÖÖÒªÁì¿ÉÒÔ½«×Ö·û´®×ª»»ÎªÊý×Ö£º

CAST º¯Êý£ºÀýÈ磬CAST(‘123’ AS NUMBER) ½«×Ö·û´® “123” ת»»ÎªÊý×Ö 123¡£

TO_NUMBER º¯Êý£ºÀýÈ磬TO_NUMBER(‘123’) Ò²¿ÉÒÔ½«×Ö·û´® “123” ת»»ÎªÊý×Ö 123¡£

¾ÙÐÐÊýѧÔËËã

Ò»µ©×Ö·û´®×ª»»ÎªÊý×Ö£¬¾Í¿ÉÒÔ¶ÔËüÃǾÙÐÐÊýѧÔËË㣬¾ÍÏñ¶ÔͨË×Êý×ÖÒ»Ñù¡£ÀýÈ磺

SELECT 10 + ‘123’ FROM DUAL; ½«·µ»Ø 133¡£

SELECT 10 * TO_NUMBER(‘123’) FROM DUAL; Ò²½«·µ»Ø 133¡£

×¢ÖØ£º

ÔÚ¾ÙÐÐÊýѧÔËËã֮ǰ£¬ÇëÈ·±£ËùÓÐ×Ö·û´®¶¼ÒÑת»»ÎªÊý×Ö¡£

ÈôÊÇ×Ö·û´®°üÀ¨·ÇÊý×Ö×Ö·û£¬Ôòת»»½«Ê§°Ü£¬²¢¿ÉÄܵ¼Ö¹ýʧ¡£

Oracle Ò²ÌṩÁËһЩÄÚÖú¯ÊýÀ´²Ù×÷×Ö·û´®ÀàÐ͵ÄÊý×Ö£¬ÀýÈç SUBSTR ºÍ INSTR¡£

ÒÔÉϾÍÊÇoracleÖÐ×Ö·û´®ÀàÐ͵ÄÊý×ÖÔõôÅÌËãµÄÏêϸÄÚÈÝ£¬¸ü¶àÇë¹Ø×¢±¾ÍøÄÚÆäËüÏà¹ØÎÄÕ£¡

ÃâÔð˵Ã÷£ºÒÔÉÏչʾÄÚÈÝȪԴÓÚÏàÖúýÌå¡¢ÆóÒµ»ú¹¹¡¢ÍøÓÑÌṩ»òÍøÂçÍøÂçÕûÀí£¬°æȨÕùÒéÓë±¾Õ¾Î޹أ¬ÎÄÕÂÉæ¼°¿´·¨Óë¿´·¨²»´ú±í尊龙凯时人生就是搏ÂËÓÍ»úÍø¹Ù·½Ì¬¶È£¬Çë¶ÁÕß½ö×ö²Î¿¼¡£±¾ÎĽӴýתÔØ£¬×ªÔØÇë˵Ã÷À´ÓÉ¡£ÈôÄúÒÔΪ±¾ÎÄÇÖÕ¼ÁËÄúµÄ°æȨÐÅÏ¢£¬»òÄú·¢Ã÷¸ÃÄÚÈÝÓÐÈκÎÉæ¼°ÓÐÎ¥¹«µÂ¡¢Ã°·¸Ö´·¨µÈÎ¥·¨ÐÅÏ¢£¬ÇëÄúÁ¬Ã¦ÁªÏµ尊龙凯时人生就是搏ʵʱÐÞÕý»òɾ³ý¡£

Ïà¹ØÐÂÎÅ

ÁªÏµ尊龙凯时人生就是搏

18523999891

¿É΢ÐÅÔÚÏß×Éѯ

ÊÂÇéʱ¼ä£ºÖÜÒ»ÖÁÖÜÎ壬9:30-18:30£¬½ÚãåÈÕÐÝÏ¢

QR code
sitemap¡¢ÍøÕ¾µØͼ