大约有 37,000 项符合查询结果(耗时:0.0275秒) [XML]

https://stackoverflow.com/ques... 

Join between tables in two different databases?

...ccount has appropriate permissions you can use: SELECT <...> FROM A.table1 t1 JOIN B.table2 t2 ON t2.column2 = t1.column1; You just need to prefix the table reference with the name of the database it resides in. sha...
https://stackoverflow.com/ques... 

Select multiple columns in data.table by their numeric indices

...ltiple columns using a vector of their numeric indices (position) in data.table ? 5 Answers ...
https://stackoverflow.com/ques... 

MySQL: Fastest way to count number of rows

...eyword after SELECT: SELECT SQL_CALC_FOUND_ROWS [needed fields or *] FROM table LIMIT 20 OFFSET 0; After you have selected needed rows, you can get the count with this single query: SELECT FOUND_ROWS(); FOUND_ROWS() has to be called immediately after the data selecting query. In conclusion,...
https://stackoverflow.com/ques... 

WITH CHECK ADD CONSTRAINT followed by CHECK CONSTRAINT vs. ADD CONSTRAINT

...re the constraint is enabled even if the default constraint behavior for a table is changed. share | improve this answer | follow | ...
https://stackoverflow.com/ques... 

When to use Common Table Expression (CTE)

I have begun reading about Common Table Expression and cannot think of a use case where I would need to use them. They would seem to be redundant as the same can be done with derived tables. Is there something I am missing or not understanding well? Can someone give me a simple example of limitati...
https://stackoverflow.com/ques... 

How to set a default value for an existing column

... This will work in SQL Server: ALTER TABLE Employee ADD CONSTRAINT DF_SomeName DEFAULT N'SANDNES' FOR CityBorn; share | improve this answer | ...
https://stackoverflow.com/ques... 

Difference between Fact table and Dimension table?

When reading a book for business objects, I came across the term- fact table and dimension table. 9 Answers ...
https://stackoverflow.com/ques... 

How to wrap text in LaTeX tables?

I am creating a report in LaTeX which involves a few tables. I'm stuck on that as my cell data in the table is exceeding the width of the page. Can I somehow wrap the text so that it falls into the next line in the same cell of the table? ...
https://stackoverflow.com/ques... 

What is causing ERROR: there is no unique constraint matching given keys for referenced table?

Below example table structure gives an ERROR: there is no unique constraint matching given keys for referenced table, and having stared at it for while now I can't figure out why this error arises in this situation. ...
https://stackoverflow.com/ques... 

td widths, not working?

...utanyspaces), the cell will stretch nevertheless, unless your CSS contains table-layout: fixed for the table. EDIT As kristina childs noted on her answer, you should avoid both the width attribute and using inline CSS (with the style attribute). It's a good practice to separate style and structure...