textareaÖеÄÄÚÈÝͨ¹ýÌí¼Ó°´Å¥Ìí¼Óµ½SQLÊý¾Ý¿âÖÐ
ÎÒ¶¨ÒåÁËÒ»¸ö textarea:
<tr bgcolor="#CCCCCC" align="center" valign="bottom">
<td align="right" valign="top" class="style1" >ÎÄÕÂÄÚÈÝ£º</td>
<td width="83%" bgcolor="#FFFFFF" align="left">
<textarea cols="75" rows="6" style="width: 1000px; height: 576px"></textarea>
</td>
</tr>
<tr bgcolor="#abb8d6">
<td colspan="2" width="588" align="center" height="55">
<asp:Button ID="Button1" runat="server" Text="Ìí¼Ó" onclick="Button1_Click" Width="55px" />
<asp:Button ID="Button2" runat="server" Text="È¡Ïû" onclick="Button2_Click" Width="55px" />
</td>
</tr>
ÏÖÔÚÏëͨ¹ý“Ìí¼Ó”°´Å¥½«textareaÖеÄÄÚÈÝÌí¼Óµ½Ö¸¶¨µÄÊý¾Ý¿âÖУ¬¸ÃÔõô°ì£¿
Ïà¹ØÎĵµ£º
¾³£»á¿´¼ûÔÚSQL³ÌÐòµÄ¿ªÍ·ÓÐÕâÑùÒ»¾ä»°
if OBJECT_ID('tb') is not null
drop table tb
º¯ÊýÓï·¨ÊÇÕâÑù£º
int OBJECT_ID('objectname');
×÷ÓÃÊÇ¿´¶ÔÏóobjectnameÊÇ·ñ´æÔÚ¡£
ÆäÖвÎÊýobjectname±íʾҪʹÓõĶÔÏó£¬ÊÇchar»òÕßncharÀàÐÍ¡£
·µ»ØÖµÀàÐÍΪint£¬Èç¹û¶ÔÏó´æÔÚ£¬Ôò·µ»Ø´Ë¶ÔÏóÔÚϵͳÖеı ......
ÔÚsqlÓï¾äÖÐÌí¼Ó±äÁ¿¡£
declare @local_variable data_type
ÉùÃ÷ʱÐèÒªÖ¸¶¨±äÁ¿µÄÀàÐÍ£¬
¿ÉÒÔʹÓÃsetºÍselect¶Ô±äÁ¿½øÐи³Öµ£¬
ÔÚsqlÓï¾äÖоͿÉÒÔʹÓÃ@local_variableÀ´µ÷ÓñäÁ¿
ÉùÃ÷ÖпÉÒÔÌṩֵ£¬·ñÔòÉùÃ÷Ö®ºóËùÓбäÁ¿½«³õʼ»¯ÎªNULL¡£
ÀýÈ磺declare @id int
&nb ......
´´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;
/ ......
SQL:Structured Query Language,1974ÄêBoyceºÍChamberlinÌá³ö.
Êý¾Ý¶¨Òå :CREATE,DROP
Êý¾Ý¿â²éѯ:SELECT
Êý¾Ý²Ù×Ý :INSERT,UPDATE,DELETE
Êý¾Ý¿ØÖÆ :GRANT,REVOKE
Ò».Êý¾ÝµÄ¶¨ÒåºÍÐÞ¸Ä:
1.¶¨Òå»ù±í
CREATE TABLE ±íÃû (<ÁÐÃû1 ÀàÐÍ[NOT NULL][,ÁÐÃû2 ÀàÐÍ[NOT NULL]>…[ÆäËû²ÎÊý]);
¹ØÓÚÀàÐÍ:
INTEGE ......
http://www.sql-server-performance.com/tips/clustered_indexes_p1.aspx
As a rule of thumb, every table should have a clustered index. Generally, but not always, the clustered index should be on a column that monotonically increases--such as an identity column, or some other column where the value is ......