大约有 40,000 项符合查询结果（耗时：0.0497秒） [XML]
ROW_NUMBER() in MySQL
... kind of isn't).
I often plump for a null-self-join:
SELECT t0.col3
FROM table AS t0
LEFT JOIN table AS t1 ON t0.col1=t1.col1 AND t0.col2=t1.col2 AND t1.col3>t0.col3
WHERE t1.col1 IS NULL;
“Get the rows in the table for which no other row with matching col1,col2 has a higher col3.” (You w...
A dependent property in a ReferentialConstraint is mapped to a store-generated column
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Is it possible that you defined a bad column relation between your tables? different columns and one was set as autonumeric.
It happened to me.
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Hide separator line on one UITableViewCell
I'm customizing a UITableView . I want to hide the line separating on the last cell ... can i do this?
37 Answers
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Make a div fill up the remaining width
...) allowed width to be set, b) has the best browser support and c) wasn't a table
– Jayen
May 21 '15 at 5:27
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Converting Select results into Insert script - SQL Server [closed]
... a variety of great features - including generating INSERT statements from tables.
Update: for SQL Server Management Studio 2012 (and newer), SSMS Toolpack is no longer free, but requires a modest licensing fee.
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How many database indexes is too many?
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It depends on the operations that occur on the table.
If there's lots of SELECTs and very few changes, index all you like.... these will (potentially) speed the SELECT statements up.
If the table is heavily hit by UPDATEs, INSERTs + DELETEs ... these will be very slow w...
addEventListener not working in IE8
...e) if you delegate the event handling to another element, for example your table
$('idOfYourTable').on("click", "input:checkbox", function(){
});
in this way you will have only one event handler, and this will work also for newly added elements. This requires jQuery >= 1.7
Otherwise use dele...
Facebook database design?
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Keep a friend table that holds the UserID and then the UserID of the friend (we will call it FriendID). Both columns would be foreign keys back to the Users table.
Somewhat useful example:
Table Name: User
Columns:
UserID PK
Emai...
SELECT * FROM X WHERE id IN (…) with Dapper ORM
...er supports this directly. For example...
string sql = "SELECT * FROM SomeTable WHERE id IN @ids"
var results = conn.Query(sql, new { ids = new[] { 1, 2, 3, 4, 5 }});
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How do I know which version of Javascript I'm using?
...ly partially, you may find 97% of ES6, 39% of ES7, kangax.github.io/compat-table/es6, and even these tables are not quite true.
– prosti
Dec 4 '16 at 21:59
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