大约有 42,000 项符合查询结果（耗时：0.0853秒） [XML]
selecting unique values from a column
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361
Use the DISTINCT operator in MySQL:
SELECT DISTINCT(Date) AS Date FROM buy ORDER BY Date DESC...
Secure hash and salt for PHP passwords
...cters. That isn't much variation. Alpha-numeric passwords are better, with 36 characters. But allowing upper and lower case, with symbols, is roughly 96 characters. That's a lot better than just letters. One problem is, to make our passwords memorable we insert patterns—which reduces entropy. Oops...
Oracle: If Table Exists
... VIEW ' || mview_name;
EXCEPTION
WHEN OTHERS THEN
IF SQLCODE != -12003 THEN
RAISE;
END IF;
END;
Type
BEGIN
EXECUTE IMMEDIATE 'DROP TYPE ' || type_name;
EXCEPTION
WHEN OTHERS THEN
IF SQLCODE != -4043 THEN
RAISE;
END IF;
END;
Constraint
BEGIN
EXECUTE IMMEDIATE...
List or IList [closed]
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Timwi
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answered Dec 30 '08 at 12:23
tvanfossontva...
How to write log base(2) in c/c++
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Joey
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answered Jun 17 '10 at 19:27
Adam CrumeA...
Gson: Directly convert String to JsonObject (no POJO)
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535
use JsonParser; for example:
JsonParser parser = new JsonParser();
JsonObject o = parser.pars...
How to create module-wide variables in Python? [duplicate]
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edited May 1 '13 at 6:55
answered Dec 30 '09 at 2:20
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MongoDB relationships: embed or reference?
...ngle document. In a world of GB of data this sounds small, but it is also 30 thousand tweets or 250 typical Stack Overflow answers or 20 flicker photos. On the other hand, this is far more information than one might want to present at one time on a typical web page. First consider what will make ...
HTML - Display image after selecting filename [duplicate]
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3 Answers
3
Active
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ImportError: numpy.core.multiarray failed to import
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131
I was getting the same error and was able to solve it by updating my numpy installation to 1.8....