大约有 43,000 项符合查询结果（耗时：0.0311秒） [XML]
Setting up foreign keys in phpMyAdmin?
... and change their type to "INNO DB"
Make sure ID is the primary key (or at least an indexed column) of the PARENT table.
In the CHILD table, define an index for the PID column.
While viewing the structure tab of the CHILD table, click the "relation view" link just above the "add fields" section.
You...
Keeping it simple and how to do multiple CTE in a query
...minutes of the first correct answer merits an upvote, which I've given, at least.
– Peter Majeed
Mar 20 '12 at 15:52
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css3 drop shadow under another div, z-index not working [duplicate]
...ght, instead of #middle. Then I didn't have to have z-index: -1, which (at least in Chrome) messed up the cursor link hover effects and caused some other odd issues.
http://jsfiddle.net/thaddeusmt/m6bvZ/
Here is the simplified code:
<div id="portal_header_light">Header Content</div>
&...
Hamcrest compare collections
... that first assertion will fail. See hasItems if you want to check that at least those elements are present.
– Joe
Jul 7 '15 at 10:37
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How can I convert a file pointer ( FILE* fp ) to a file descriptor (int fd)?
...is not standard, which is why it might make sense to mention the header at least.
– AnT
Jul 2 '10 at 23:55
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jQuery: How to capture the TAB keypress within a Textbox
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@AppleGrew: it says so, yes, but it's not true - at least for keypress. For Tab e.which is 0 and e.keyCode is 9 (as it should be). Tested in FF 3.5.16, jQuery 1.6.2.
– johndodo
Oct 7 '11 at 10:20
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How do you perform a left outer join using linq extension methods
... an alternative to the currently selected answer that (in my experience at least) has been more commonly what I'm after
// Option 1: Expecting either 0 or 1 matches from the "Right"
// table (Bars in this case):
var qry = Foos.GroupJoin(
Bars,
foo => foo.Foo_Id,
bar...
What is the way to quick-switch between tabs in Xcode 4
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That should be command + shift + ..., I think. At least on my machine.
– Chris Ladd
Feb 7 '12 at 21:54
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Reference alias (calculated in SELECT) in WHERE clause
... same expression.
PS your fears seem unfounded. In this simple example at least, SQL Server is smart enough to only perform the calculation once, even though you've referenced it twice. Go ahead and compare the plans; you'll see they're identical. If you have a more complex case where you see the e...
pandas GroupBy columns with NaN (missing) values
...is:
df['b'] = df['b'].apply(lambda x: x if not np.isnan(x) else -1)
(At least that's the behavior for Pandas 0.19.2. Sorry to add it as a different answer, I do not have enough reputation to comment.)
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