Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

SQL*PLUSÖк¯Êý

´´½¨º¯Êý
CREATE OR REPLACE FUNCTION ntfuc(inp IN NUMBER)
RETURN NUMBER
IS
ntmp NUMBER;
BEGIN
ntmp := inp;
RETURN ntmp;
END ntfuc;
/
Ö´Ðиú¯Êýʱ
DECLARE
rcn NUMBER;
BEGIN
rcn := ntfunc(1);
END;
/


Ïà¹ØÎĵµ£º

SQLÓû§È¨ÏÞ¹ÜÀí·þÎñÆ÷

Óû§È¨ÏÞ¹ÜÀí
Ò»¡¢·þÎñÆ÷µÇ¼ÕʺźÍÓû§ÕʺŹÜÀí
1.SQL Server·þÎñÆ÷µÇ¼¹ÜÀí
²»¹ÜʹÓÃÄÄÖÖÈÏ֤ģʽ£¬Óû§¶¼±ØÐëÏȾ߱¸ÓÐЧµÄÓû§µÇ¼Õʺš£SQL ServerÓÐÈý¸öĬÈϵÄÓû§µÇ¼Õʺţº¼´sa¡¢Builtin\administratorsºÍguest¡£saÊÇϵͳ¹ÜÀíÔ±(system administrator)µÄ¼ò³Æ£¬ÊÇÒ»¸öÌØÊâµÄÓû§£¬ÔÚSQL ServerϵͳºÍËùÓÐÊý¾Ý¿âÖÐÓ ......

sql ÖÐcaseÓ÷¨

Case¾ßÓÐÁ½ÖÖ¸ñʽ¡£¼òµ¥Caseº¯ÊýºÍCaseËÑË÷º¯Êý¡£
--¼òµ¥Caseº¯Êý
CASE sex
         WHEN '1' THEN 'ÄÐ'
         WHEN '2' THEN 'Å®'
ELSE 'ÆäËû' END
--CaseËÑË÷º¯Êý
CASE WHEN sex = '1' THEN 'ÄÐ'
     ......

SQL´¥·¢Æ÷ʵÀý

¶¨Ò壺 ºÎΪ´¥·¢Æ÷£¿ÔÚSQL ServerÀïÃæÒ²¾ÍÊǶÔijһ¸ö±íµÄÒ»¶¨µÄ²Ù×÷£¬´¥·¢Ä³ÖÖÌõ¼þ£¬´Ó¶øÖ´ÐеÄÒ»¶Î³ÌÐò¡£´¥·¢Æ÷ÊÇÒ»¸öÌØÊâµÄ´æ´¢¹ý³Ì¡£
      ³£¼ûµÄ´¥·¢Æ÷ÓÐÈýÖÖ£º·Ö±ðÓ¦ÓÃÓÚInsert , Update , Delete ʼþ¡£
      ÎÒΪʲôҪʹÓô¥·¢Æ÷£¿±ÈÈ磬ÕâôÁ½¸ö±í£º
& ......

SQL UNION ºÍUNION ALL ²Ù×÷·û


SQL UNION ²Ù×÷·û
UNION ²Ù×÷·ûÓÃÓںϲ¢Á½¸ö»ò¶à¸ö SELECT Óï¾äµÄ½á¹û¼¯¡£
Çë×¢Ò⣬UNION ÄÚ²¿µÄ SELECT Óï¾ä±ØÐëÓµÓÐÏàͬÊýÁ¿µÄÁС£ÁÐÒ²±ØÐëÓµÓÐÏàËÆµÄÊý¾ÝÀàÐÍ¡£Í¬Ê±£¬Ã¿Ìõ SELECT Óï¾äÖеÄÁеÄ˳Ðò±ØÐëÏàͬ¡£
SQL UNION Óï·¨
SELECT column_name(s) from table_name1
UNION
SELECT column_name(s) from table_na ......

SQL ³£ÓÃÓï¾äÒÔ¼°º¯Êý

SQL ³£ÓÃÓï¾äÒÔ¼°º¯ÊýÖ®Ò» 
SELECT --´ÓÊý¾Ý¿â±íÖмìË÷Êý¾ÝÐкÍÁÐ
¡¡¡¡¡¡¡¡¡¡¡¡INSERT --ÏòÊý¾Ý¿â±íÌí¼ÓÐÂÊý¾ÝÐÐ
¡¡¡¡¡¡¡¡¡¡¡¡DELETE --´ÓÊý¾Ý¿â±íÖÐɾ³ýÊý¾ÝÐÐ
¡¡¡¡¡¡¡¡¡¡¡¡UPDATE --¸üÐÂÊý¾Ý¿â±íÖеÄÊý¾Ý
¡¡¡¡--Êý¾Ý¶¨Òå
¡¡¡¡ CREATE TABLE --´´½¨Ò»¸öÊý¾Ý¿â±í
¡¡¡¡¡¡¡¡¡¡¡¡DROP TABLE --´ÓÊý¾Ý¿âÖÐɾ³ý±í
......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ