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SQLÓï¾äPART8

PairWise subquery:
e.g.:
select * from wf_docsort where (ndocsortid,nmoduleinfoid)  in (select ndocsortid, nmoduleinfoid from wf_docsort where instr(cname,'ÎÄ')>0)
the above sql is the same function as:
select * from wf_docsort where ndocsortid = (select ndocsortid from wf_docsort where instr(cname,'xx')>0) and nmoduleinfoid = (select nmoduleinfoid from wf_docsort where instr(cname,'xx')>0)
A scalar subquery expression is a subquery that: returns exactly one column value from one row. Scalar subqueries can be used in: 1) The condition and expression part of DECODE and CASE 2) All clauses of SELECT except GROUP BY 3) The SET clause and WHERE clause of an UPDATE statement
e.g.:
select * from wf_docsort
results:
1    1    ÊÕÎÄ            SHOUWEN
2    1    ·¢ÎÄ            FAWEN
3    1    ½»°ì            JIAOBAN
4    2    Öµ°à±¨¸æ     REPORT
5    3    ¶½²ì¶½°ì     SUPERVISAL
6    2    Öµ°à¿ì±¨     DAILYREPORT
7    2    ÎÒµÄÊÂÇé     NOTIFY
8    4    Ìá°¸            RESOLUTION
9    4    ½¨Òé            SUGGESTION
select NDOCSORTID, NMODULEINFOID,CNAME,KEY,(
       case when nmoduleinfoid=(
               select nmoduleinfoid from wf_moduleinfo where nmoduleinfoid=1
        ) then 'JEAN1' else (case when nmoduleinfoid=(select nmoduleinfoid from wf_moduleinfo
 &n


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SQL SERVER 2005 .NET UDF

using System;
using System.Text.RegularExpressions;
using Microsoft.SqlServer.Server;
public partial class UserDefinedFunctions
{
[Microsoft.SqlServer.Server.SqlFunction(IsDeterministic = true,IsPrecise = true)]
public static bool RegExIsMatch(string pattern,string matchString)
{ ......

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µÚʮһÌ⣺
Óбístudents(name,class,grade),ÇëÓñê×¼sqlÓï¾äÍê³É
name class grade
ÕÅÈý Êýѧ 81
ÀîËÄ ÓïÎÄ 70
ÍõÎå Êýѧ 90
ÕÅÈý ÓïÎÄ 60
ÀîËÄ Êýѧ 100
ÍõÎå ÓïÎÄ 90
ÍõÎå Ó¢Óï 81
ÒªÇó: ÓÃsqlÓï¾äÊä³ö¸÷ÃŹ¦¿Î¶¼´óÓÚ80·ÖµÄͬѧÐÕÃû?
create table students (
name varchar(25),
class varchar(25),
grad ......

ORACLE PL/SQL ¶ÔÏó(object)ѧϰ±Ê¼Ç(Èý)

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INSTANTIABLE¹Ø¼ü×Ö±íʾÎÒÃÇ¿ÉÒÔ´Ó¸ÃÀàÐÍÖÐʵÀý»¯»òÕß´´½¨¶ÔÏ ......

SQLÓï¾äPART2

Subquery: (single-row subqueries and multi-rows subqueries).
select select_list
from table
where expr operator (select select_list from table);
single-row subqueries operator: =, >, >=, <, <=, <>
e.g.:
1. select department_id, min(salary) from employees group by department_id ......

SQLÓï¾äPART5

Confirming granted privileges
Data Dictionary View                Description
ROLE_SYS_PRIVS                System privileges granted to roles
ROLE_TAB_PRIVS    & ......
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