sqlÄ£ºý²éѯ
SELECT * from user WHERE name LIKE '%Èý%';
½«»á°ÑnameΪ“ÕÅÈý”£¬“Èý½Å蔣¬“ÌÆÈý²Ø”µÈµÈÓГÈý”µÄÈ«ÕÒ³öÀ´£»
ÔÚ½øÐÐÊý¾Ý¿â²éѯʱ£¬ÓÐÍêÕû²éѯºÍÄ£ºý²éѯ֮·Ö¡£
Ò»°ãÄ£ºýÓï¾äÈçÏ£º
SELECT ×Ö¶Î from ±í WHERE ij×Ö¶Î Like Ìõ¼þ
ÆäÖйØÓÚÌõ¼þ£¬SQLÌṩÁËËÄÖÖÆ¥Åäģʽ£º
1£¬%£º±íʾÈÎÒâ0¸ö»ò¶à¸ö×Ö·û¡£¿ÉÆ¥ÅäÈÎÒâÀàÐͺͳ¤¶ÈµÄ×Ö·û£¬ÓÐЩÇé¿öÏÂÈôÊÇÖÐÎÄ£¬ÇëʹÓÃÁ½¸ö°Ù·ÖºÅ£¨%%£©±íʾ¡£
±ÈÈç SELECT * from [user] WHERE u_name LIKE '%Èý%'
½«»á°Ñu_nameΪ“ÕÅÈý”£¬“ÕÅèÈý”¡¢“Èý½Å蔣¬“ÌÆÈý²Ø”µÈµÈÓГÈý”µÄ¼Ç¼ȫÕÒ³öÀ´¡£
ÁíÍ⣬Èç¹ûÐèÒªÕÒ³öu_nameÖмÈÓГÈý”ÓÖÓГ蔵ļǼ£¬ÇëʹÓÃandÌõ¼þ
SELECT * from [user] WHERE u_name LIKE '%Èý%' AND u_name LIKE '%è%'
ÈôʹÓà SELECT * from [user] WHERE u_name LIKE '%Èý%è%'
ËäÈ»ÄÜËÑË÷³ö“Èý½Å蔣¬µ«²»ÄÜËÑË÷³ö·ûºÏÌõ¼þµÄ“ÕÅèÈý”¡£
2£¬_£º ±íʾÈÎÒâµ¥¸ö×Ö·û¡£Æ¥Åäµ¥¸öÈÎÒâ×Ö·û£¬Ëü³£ÓÃÀ´ÏÞÖÆ±í´ïʽµÄ×Ö·û³¤¶ÈÓï¾ä£º
±ÈÈç SELECT * from [user] WHERE u_name LIKE '_Èý_'
Ö»ÕÒ³ö“ÌÆÈý²Ø”ÕâÑùu_nameΪÈý¸ö×ÖÇÒÖмäÒ»¸ö×ÖÊÇ“Èý”µÄ£»
ÔÙ±ÈÈç SELECT * from [user] WHERE u_name LIKE 'Èý__';
Ö»ÕÒ³ö“Èý½Åè”ÕâÑùnameΪÈý¸ö×ÖÇÒµÚÒ»¸ö×ÖÊÇ“Èý”µÄ£»
3£¬[ ]£º±íʾÀ¨ºÅÄÚËùÁÐ×Ö·ûÖеÄÒ»¸ö£¨ÀàËÆÕýÔò±í´ïʽ£©¡£Ö¸¶¨Ò»¸ö×Ö·û¡¢×Ö·û´®»ò·¶Î§£¬ÒªÇóËùÆ¥Åä¶ÔÏóΪËüÃÇÖеÄÈÎÒ»¸ö¡£
±ÈÈç SELECT * from [user] WHERE u_name LIKE '[ÕÅÀîÍõ]Èý'
½«ÕÒ³ö“ÕÅÈý”¡¢“ÀîÈý”¡¢“ÍõÈý”£¨¶ø²»ÊÇ“ÕÅÀîÍõÈý”£©£»
Èç [ ] ÄÚÓÐһϵÁÐ×Ö·û£¨01234¡¢abcdeÖ®ÀàµÄ£©Ôò¿ÉÂÔдΪ“0-4”¡¢“a-e”
SELECT * from [user] WHERE u_name LIKE 'ÀÏ[1-9]'
½«ÕÒ³ö“ÀÏ1”¡¢“ÀÏ2”¡¢……¡¢“ÀÏ9”£»
4£¬[^ ] £º±íʾ²»ÔÚÀ¨ºÅËùÁÐÖ®Äڵĵ¥¸ö×Ö·û¡£ÆäȡֵºÍ [] Ïàͬ£¬µ«ËüÒªÇóËùÆ¥Åä¶ÔÏóΪָ¶¨×Ö·ûÒÔÍâµÄÈÎÒ»¸ö×Ö·û¡£
±ÈÈç SELECT * from [user] WHERE u_name LIKE '[^ÕÅÀîÍõ]Èý'
½«ÕÒ³ö²»ÐÕ“ÕÅ”¡¢“À¢“Íõ”µÄ“ÕÔÈý”¡¢“ËïÈý
Ïà¹ØÎĵµ£º
±êÇ©£ºÊý¾Ý·ÃÎÊ ADO.NET
µ÷ÓÃSQL´æ´¢¹ý³Ì ´æ´¢¹ý³ÌÔÚÒ»¸öµ¥ÔªÖзâ×°Á˸´ÔÓµÄSQL²éѯºÍÊý¾Ý¹ý³Ì£¬¿ÉÒÔÓɶà¸ö³ÌÐò»òÓû§Ö®¼äµ÷Óá£
Àý£º
......
Sql server2005ÓÅ»¯²éѯËÙ¶È51·¨²éѯËÙ¶ÈÂýµÄÔÒòºÜ¶à£¬³£¼ûÈçϼ¸ÖÖ£¬´ó¼Ò¿ÉÒԲο¼Ï¡£
I/OÍÌÍÂÁ¿Ð¡£¬ÐγÉÁËÆ¿¾±Ð§Ó¦¡£
¡¡¡¡Ã»Óд´½¨¼ÆËãÁе¼Ö²éѯ²»ÓÅ»¯¡£
¡¡¡¡ÄÚ´æ²»×ã¡£
¡¡¡¡ÍøÂçËÙ¶ÈÂý¡£
¡¡¡¡²éѯ³öµÄÊý¾ÝÁ¿¹ý´ó(¿ÉÒÔ²ÉÓöà´Î²éѯ£¬ÆäËûµÄ·½·¨½µµÍÊý¾ÝÁ¿)¡£
¡¡¡¡Ëø»òÕßËÀËø(ÕâÒ²ÊDzéѯÂý×î³£¼ûµÄÎÊÌ ......
£¨1£© Ñ¡Ôñ×îÓÐЧÂʵıíÃû˳Ðò(Ö»ÔÚ»ùÓÚ¹æÔòµÄÓÅ»¯Æ÷ÖÐÓÐЧ)£º
ORACLE µÄ½âÎöÆ÷°´ÕÕ´ÓÓÒµ½×óµÄ˳Ðò´¦Àífrom×Ó¾äÖеıíÃû£¬from×Ó¾äÖÐдÔÚ×îºóµÄ±í(»ù´¡±í driving table)½«±»×îÏÈ´¦Àí£¬ÔÚfrom×Ó¾äÖаüº¬¶à¸ö±íµÄÇé¿öÏÂ,Äã±ØÐëÑ¡Ôñ¼Ç¼ÌõÊý×îÉٵıí×÷Ϊ»ù´¡±í¡£Èç¹ûÓÐ3¸öÒÔÉϵıíÁ¬½Ó²éѯ, ÄǾÍÐèҪѡÔñ½»²æ±í(intersectio ......
Sample1:
/* Variable Declaration */
DECLARE @EmpID AS SMALLINT
DECLARE @SQLQuery AS NVARCHAR(500)
/* Build and Execute a Transact-SQL String with a single parameter value Using EXECUTE Command */
SET @EmpID = 1001
SET @SQLQuery = 'SELECT * from tblEmployees WHERE EmployeeID = ' + CAST(@EmpID A ......
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'
  ......