SQL SERVERµÄÉ󼯹¦ÄÜ
ÆôÓÃc2ÉóºËÃüÁîÈçÏ£º
EXEC sp_configure 'c2 audit mode', '1' RECONFIGURE
SQL ServerÒÔ128KB´óСµÄ¿éΪµ¥Î»°ÑÊý¾ÝдÈë¸ú×ÙÎļþ¡£Òò´Ë£¬µ±SQL Server·ÇÕý³£Í£Ö¹Ê±£¬×î¶à¿ÉÄܶªÊ§128
KBµÄÈÕÖ¾Êý¾Ý¡£¿ÉÒÔÏëÏ󣬰üº¬ÉóºËÐÅÏ¢µÄÈÕÖ¾Îļþ½«ÒԺܿìµÄËÙ¶ÈÔö´ó¡£ÀýÈ磬ij´ÎÊÔÑéÖ»·ÃÎÊÁËÈý¸ö±í£¬¸ú×ÙÎļþÒѾ³¬¹ýÁË1MB¡£µ±¸ú×ÙÎļþ³¬¹ý
200MBʱ£¬C2ÉóºË½«¹Ø±Õ¾ÉÎļþ²¢´´½¨ÐÂÎļþ¡£Ã¿´ÎSQL ServerÆô¶¯µÄʱºò£¬Ëü»á´´½¨Ò»¸öеĸú×ÙÎļþ¡£Èç¹û´ÅÅ̿ռ䲻×㣬SQL
Server½«Í£Ö¹ÔËÐУ¬Ö±ÖÁÎÒÃÇΪÉóºËÈÕÖ¾Êͷųö×ã¹»µÄ´ÅÅÌ¿Õ¼ä²¢ÖØÐÂÆô¶¯SQL ServerʵÀý¡£ÔÚSQL
ServerÆô¶¯µÄʱºò£¬¿ÉÒÔʹÓÃ-f²ÎÊý½ûÓÃÉóºË¡£
Ïà¹ØÎĵµ£º
SELECT TOP 10 *
from HumanResources.Employee
WHERE EmployeeID NOT IN (SELECT TOP 0 EmployeeID from HumanResources.Employee ORDER BY EmployeeID desc)
ORDER BY EmployeeID desc
—————————————————&md ......
Äê³õµÄʱºòÒ»Ö±ÔÚ×öÒ»¸öÍøÕ¾MSSQL2000->MySQL5µÄÇ¨ÒÆ¹¤×÷£¬ÒòΪ²ÉÓÃÁ˲»Í¬µÄ³ÌÐòϵͳ£¬ËùÒÔÖ÷ÒªÎÊÌâÔÚÊý¾ÝµÄÇ¨ÒÆ¡£ÓÉÓÚ2¸öϵͳÊý¾Ý¿â½á¹¹²îÒì·Ç³£´ó£¬²»·½±ã²ÉÈ¡SQLSERVERÀïµ¼ÈëMYSQLµÄODBCÊý¾ÝÔ´µÄ¹¦ÄÜ£¨Ò²²»ÍƼöÕâô×ö£¬×Ö¶ÎÀàÐ͵Ȳ»Í¬µã»á¸ãËÀÈ˵ġ«£©£¬Òò´Ë¾ÍÔÚWINDOWSÏÂ×Ô¼ºÐ´PHP½Å±¾´ÓSQLSERVERÀï¶ÁÊý¾Ý£¬È»ºó°´ÕÕ ......
¾ßÓй̶¨ÓÐЧλÊýºÍСÊýλÊýµÄÊýÖµ×ÊÁÏÀàÐÍ¡£
decimal[ (p[ , s] )] and numeric[ (p[ , s] )]
¹Ì¶¨ÓÐЧλÊýºÍСÊýλÊýµÄÊý×Ö¡£µ±Ê¹ÓÃ×î´óÓÐЧλÊýʱ£¬ÓÐЧֵÊÇ´Ó - 10^38 +1 µ½ 10^38 - 1¡£decimal µÄ SQL-92 ͬÒå×ÖÊÇ dec ºÍ dec(p, s)¡£numeric µÄ¹¦ÄÜÏàµ±ì¶ decimal¡£
p (ÓÐЧλÊý)
¿É´¢´æµÄ×î´óÊ®½øÎ»Êý×ÜÊý£¬Ð¡ ......
ÔÚ½éÉÜGROUP BY ºÍ HAVING ×Ó¾äǰ£¬ÎÒÃDZØÐèÏȽ²½²sqlÓïÑÔÖÐÒ»ÖÖÌØÊâµÄº¯Êý£º¾ÛºÏº¯Êý£¬ÀýÈçSUM, COUNT, MAX, AVGµÈ¡£ÕâЩº¯ÊýºÍÆäËüº¯ÊýµÄ¸ù±¾Çø±ð¾ÍÊÇËüÃÇÒ»°ã×÷ÓÃÔÚ¶àÌõ¼Ç¼ÉÏ¡£
SELECT SUM(population) from bbc
¡¡¡¡ÕâÀïµÄSUM×÷ÓÃÔÚËùÓзµ»Ø¼Ç¼µÄpopulation×Ö¶ÎÉÏ£¬½á¹û¾ÍÊǸòéѯֻ·µ»ØÒ»¸ö½á¹û£¬¼´ËùÓйú¼ÒµÄ× ......