大约有 42,000 项符合查询结果（耗时：0.0306秒） [XML]
is it possible to select EXISTS directly as a bit?
... table (name nvarchar(16))
declare @b bit
insert @t select N'Simon Byorg' union select N'Roe Bott'
select @b = isnull((select top 1 1 from @t where name = N'Simon Byorg'),0)
select @b whenTrue
select @b = isnull((select top 1 1 from @t where name = N'Anne Droid'),0)
select @b whenFalse
...
Getting the PublicKeyToken of .Net assemblies
...Pravat> ([system.reflection.assembly]::loadfile("C:\Program Files (x86)\MySQL\Connector NET 6.6.5\Assemblies\v4.0\MySql.Data.dll")).FullName
like
PS C:\Users\Pravat> ([system.reflection.assembly]::loadfile("dll full path")).FullName
and will appear like
MySql.Data, Version=6.6.5.0, Cu...
setting multiple column using one update
How to set multiple columns of a table using update query in mysql?
2 Answers
2
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How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
... very frequently asked question here is how to do an upsert, which is what MySQL calls INSERT ... ON DUPLICATE UPDATE and the standard supports as part of the MERGE operation.
...
What's the longest possible worldwide phone number I should consider in SQL varchar(length) for phon
...
I know that should be the case, but it's not always. In MySQL (for example) the full length is used for sorting. It's best to apply at least some minimal effort.
– Morgan Tocker
Jul 20 '10 at 18:23
...
Cleanest way to build an SQL string in Java
...d MERGE. You can create SQL like this:
String sql1 = DSL.using(SQLDialect.MYSQL)
.select(A, B, C)
.from(MY_TABLE)
.where(A.equal(5))
.and(B.greaterThan(8))
.getSQL();
String sql2 = DSL.using(SQLDialect.MYSQL)
...
INNER JOIN ON vs WHERE clause
....
It's easier to see this with the WHERE syntax.
As for your example, in MySQL (and in SQL generally) these two queries are synonyms.
Also note that MySQL also has a STRAIGHT_JOIN clause.
Using this clause, you can control the JOIN order: which table is scanned in the outer loop and which one is...
Get the last inserted row ID (with SQL statement) [duplicate]
...e:
INSERT dbo.foo(name)
OUTPUT inserted.ID INTO @IDs(ID)
SELECT N'Fred'
UNION ALL
SELECT N'Bob';
SELECT ID FROM @IDs;
The nice thing about this method is (a) it handles multi-row inserts (SCOPE_IDENTITY() only returns the last value) and (b) it avoids this parallelism bug, which can lead to wr...
剖析程序的内存布局 - C/C++ - 清泛网 - 专注C/C++及内核技术
...拟地址空间的布局就讲这些吧。下一篇文章将讨论内核是如何跟踪这些内存区域的。我们会分析内存映射，看看文件的读写操作是如何与之关联的，以及内存使用概况的含义。
布局 内存 程序
Setting up foreign keys in phpMyAdmin?
...dmin lets you define foreign keys using their "relations" view. But since, MySQL only supports foreign constraints on "INNO DB" tables, the first step is to make sure the tables you are using are of that type.
To setup a foreign key so that the PID column in a table named CHILD references the ID co...