大约有 3,549 项符合查询结果（耗时：0.0211秒） [XML]
Is it possible to roll back CREATE TABLE and ALTER TABLE statements in major SQL databases?
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http://wiki.postgresql.org/wiki/Transactional_DDL_in_PostgreSQL:_A_Competitive_Analysis provides an overview of this issue from PostgreSQL's perspective.
Is DDL transactional according to this document?
PostgreSQL - yes
MySQL - no; DDL cause...
how do I query sql for a latest record date for each user
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When working with postgresql would this version be faster than using an IN (subquery) instead of the inner join?
– TheOne
Sep 7 '14 at 1:38
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Using a Single Row configuration table in SQL Server database. Bad idea?
...le rows in the "special" single row settings table. I overcame this by (in SQL Server):
adding a new bit column with a default value of 0
creating a check constraint to ensure that this column has a value of 0
creating a unique constraint on the bit column
This means that only one row can exist in...
MySQL Insert into multiple tables? (Database normalization?)
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No, you can't insert into multiple tables in one MySQL command. You can however use transactions.
BEGIN;
INSERT INTO users (username, password)
VALUES('test', 'test');
INSERT INTO profiles (userid, bio, homepage)
VALUES(LAST_INSERT_ID(),'Hello world!', 'http://www.stack...
How to write a foreach in SQL Server?
... an email or write to a file) rather than just shuffle stuff around within SQL, you need to use a cursor or something similar (not set logic). Likely people who come to SQL and try to do something RBAR they are coming to it as a programmer who needs it to do something useful like this.
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Fetch the row which has the Max value for a column
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Anyone care to post a link to the MySQL equivalent of this, if there is one?
– redolent
Jan 10 '15 at 2:35
2
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SQLAlchemy IN clause
I'm trying to do this query in sqlalchemy
6 Answers
6
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Validation failed for one or more entities while saving changes to SQL Server Database using Entity
...DbEntityValidationException, DbUpdateException, datetime2 range errors (MS SQL), and include key of invalid entity in message (useful when savind many entities at one SaveChanges call).
First, override SaveChanges in DbContext class:
public class AppDbContext : DbContext
{
public override int ...
How to do a join in linq to sql with method syntax?
I have seen lots of examples in LINQ to SQL examples on how to do a join in query syntax but I am wondering how to do it with method syntax? For example how might I do the following
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How do I get the size of a java.sql.ResultSet?
...his method to calculate ResultSet size. This is great...no use of an extra SQL parameter. Please comment on this method.
– Madeyedexter
Mar 13 '15 at 5:21
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