大约有 3,620 项符合查询结果（耗时：0.0198秒） [XML]
What does the 'b' character do in front of a string literal?
...re familiar with:
Java or C#, think of str as String and bytes as byte[];
SQL, think of str as NVARCHAR and bytes as BINARY or BLOB;
Windows registry, think of str as REG_SZ and bytes as REG_BINARY.
If you're familiar with C(++), then forget everything you've learned about char and strings, becaus...
Entity Framework: table without primary key
...
I think this is solved by Tillito:
Entity Framework and SQL Server View
I'll quote his entry below:
We had the same problem and this is the solution:
To force entity framework to use a column as a primary key, use ISNULL.
To force entity framework not to use a column as a pri...
ORA-12514 TNS:listener does not currently know of service requested in connect descriptor
...
(SERVICE_NAME = *<servicenamefromDB>*)
)
)
then I ran:
sqlplus user@TEST
Success!
The listener is basically telling you that whatever service_name you are using isn't a valid service according to the DB.
(*I was running sqlplus from Win7 client workstation to remote DB and b...
Postgres: How to do Composite keys?
...
Not the answer you're looking for? Browse other questions tagged sql postgresql composite-key or ask your own question.
View's SELECT contains a subquery in the FROM clause
...
As per documentation:
MySQL Docs
The SELECT statement cannot contain a subquery in the FROM clause.
Your workaround would be to create a view for each of your subqueries.
Then access those views from within your view view_credit_status
...
What are the possible values of the Hibernate hbm2ddl.auto configuration and what do they do
...the default is to make no database changes. Instead, we manually create an SQL DDL update script that applies changes from one version to the next.
share
|
improve this answer
|
...
MySQL select with CONCAT condition
...
FROM
users
HAVING firstlast = "Bob Michael Jones"
Here is a working SQL Fiddle.
share
|
improve this answer
|
follow
|
...
What is this date format? 2011-08-12T20:17:46.384Z
...er compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes. Hibernate 5 & JPA 2.2 support java.time.
Where to obtain the java.time classes?
Java SE 8, Java SE 9, Java SE 10, Java SE 11, and later - Part of the standard Java API with a bundled implementation.
Java...
What is the difference between join and merge in Pandas?
...
To put it analogously to SQL "Pandas merge is to outer/inner join and Pandas join is to natural join". Hence when you use merge in pandas, you want to specify which kind of sqlish join you want to use whereas when you use pandas join, you really want...
What is the difference between integration testing and functional testing? [closed]
...est written against a single class, integration tests to be nunit tests or sql script tests that required more than class, or a database, or another system (usually requiring a full install) and functional tests are the test that QA runs or automated UI testing.
– aceinthehole
...