大约有 9,000 项符合查询结果（耗时：0.0401秒） [XML]
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
... with JDBC, you need to be sure that you can connect to the database using SQL*Plus. If you're not familiar with SQL*Plus, it's a command-line tool for connecting to Oracle databases that has been a standard part of Oracle for a long time and it is included with Oracle XE.
When connecting to an Or...
Equals(=) vs. LIKE
When using SQL, are there any benefits of using = in a WHERE clause instead of LIKE ?
15 Answers
...
How can I group by date time column without taking time into consideration
...
do you know how I would do the same with LINQ to SQL?
– The Muffin Man
May 19 '11 at 5:56
1
...
Reintegrate can only be used if revisions X through Y were previously merged from to reintegra
...8365,18404
Error:
Error: branches/myproject/userdata/auto_create_db.sql
Error:
Error: Missing ranges:
Error: /trunk/userdata/auto_create_db.sql:18406
Error:
Error:
Error: branches/myproject/userdata/create_audit_tables_triggers_uds.sql
Error:
Error: Missing rang...
How to filter SQL results in a has-many-through relation
... skin a cat?
The precise cat-skinning environment for this test:
PostgreSQL 9.0 on Debian Squeeze with decent RAM and settings.
6.000 students, 24.000 club memberships (data copied from a similar database with real life data.)
Slight diversion from the naming schema in the question: student.id is...
How to create a unique index on a NULL column?
I am using SQL Server 2005. I want to constrain the values in a column to be unique, while allowing NULLS.
4 Answers
...
LEFT OUTER JOIN in LINQ
...roups.Name
}
);
var xy = (query2).ToList();
When used with LINQ 2 SQL it will translate nicely to the following very legible SQL query:
SELECT
users.USR_ID AS UserId
,users.USR_User AS UserName
,groups.ID AS UserGroupId
,groups.Name AS GroupName
FROM T_User AS users
...
How can I join multiple SQL tables using the IDs?
...%3a%2f%2fstackoverflow.com%2fquestions%2f9853586%2fhow-can-i-join-multiple-sql-tables-using-the-ids%23new-answer', 'question_page');
}
);
Post as a guest
Na...
BACKUP LOG cannot be performed because there is no current database backup
...
Please see below image and apply changes in SqlServer :
first right click on Database --> Task --> Restore --> Select Backup File -->
Finally Apply Change in Options Tab.
share
...
What's wrong with nullable columns in composite primary keys?
...
In Sql Server a unique constraint that has a nullable column, allows the value 'null' in that column only once (given identical values for the other columns of the constraint). So such a unique constraint essentially behaves lik...