大约有 40,000 项符合查询结果（耗时：0.0292秒） [XML]
Generate GUID in MySQL for existing Data?
...e BEFORE UPDATE on YourTable
FOR EACH ROW
BEGIN
SET new.guid_column := (SELECT UUID());
END
//
Then execute
UPDATE YourTable set guid_column = (SELECT UUID());
And DROP TRIGGER beforeYourTableUpdate;
UPDATE
Another solution that doesn't use triggers, but requires primary key or unique inde...
Oracle “Partition By” Keyword
...d then use that in a calculation against this records salary without a sub select, which is much faster.
Read the linked AskTom article for further details.
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Highlight all occurrence of a selected word?
How can I highlight all occurrence of a selected word in GVim, like in Notepad++?
15 Answers
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SQL Query to concatenate column values from multiple rows in Oracle
...on on string aggregation techniques. A very common one is to use LISTAGG:
SELECT pid, LISTAGG(Desc, ' ') WITHIN GROUP (ORDER BY seq) AS description
FROM B GROUP BY pid;
Then join to A to pick out the pids you want.
Note: Out of the box, LISTAGG only works correctly with VARCHAR2 columns.
...
Bootstrap datepicker hide after selection
How do I hide the calendar after a date is selected? Is there a specific function that I can use? My code below:
18 Answer...
MySQL order by before group by
... table on both the post_author and the max date.
The solution should be:
SELECT p1.*
FROM wp_posts p1
INNER JOIN
(
SELECT max(post_date) MaxPostDate, post_author
FROM wp_posts
WHERE post_status='publish'
AND post_type='post'
GROUP BY post_author
) p2
ON p1.post_author = p...
Any gotchas using unicode_literals in Python 2.6?
..., the clearer the code is, since what you want is to manipulate strings of characters, not arrays of bytes with an externally implied encoding.
– Eric O Lebigot
Sep 3 '10 at 12:35
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What is your favorite C programming trick? [closed]
.... you could make a string "object" like this:
struct X {
int len;
char str[1];
};
int n = strlen("hello world");
struct X *string = malloc(sizeof(struct X) + n);
strcpy(string->str, "hello world");
string->len = n;
here, we've allocated a structure of type X on the heap that is the...
What's the best UI for entering date of birth? [closed]
What is the best method for date of birth selector?
24 Answers
24
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Select second last element with css
I already know of :last-child. But is there a way to select the div:
2 Answers
2
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