大约有 5,887 项符合查询结果（耗时：0.0124秒） [XML]
Convert timestamp to date in MySQL query
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Convert timestamp to date in MYSQL
Make the table with an integer timestamp:
mysql> create table foo(id INT, mytimestamp INT(11));
Query OK, 0 rows affected (0.02 sec)
Insert some values
mysql> insert into foo values(1, 1381262848);
Query OK, 1 row affected (...
ActiveRecord: size vs count
...e way to go if you are using the data.
Example: Summary of a fully loaded table, titles of displayed data, etc.
size
It checks if the data was loaded (i.e. already in rails) if so, then just count it, otherwise it calls count. (plus the pitfalls, already mentioned in other entries).
def size
l...
split string only on first instance - java
... pass the integer param to the split method
String stSplit = "apple=fruit table price=5"
stSplit.split("=", 2);
Here is a java doc reference : String#split(java.lang.String, int)
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python pandas dataframe to dictionary
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Nice and elegant solution, but on a 50k rows table, it is about 6 times slower than my ugly solution below.
– dalloliogm
Jun 24 '14 at 10:44
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How does facebook, gmail send the real time notification?
...oblems away. In terms of PHP, you could simply poll an event log database table in your PHP script, and only return to the client when something happens? There are, I expect, many ways of implementing this.
Implementing:
Server Side:
There appear to be a few implementations of comet libraries in...
How can I sanitize user input with PHP?
...o be guaranteed against SQL injection.
Please see my website http://bobby-tables.com/ for more about preventing SQL injection.
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Removing index column in pandas when reading a csv
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Using df.to_sql("table",cursor,if_exists="append",index=False) also fixes the sqlite error sqlite3.OperationalError: table message has no column named index
– Anna
Jun 3 '18 at 0:55
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Could not find an implementation of the query pattern
...se connection using LINQ.
First I add a new LINQ to SQL class, and drag my table called "tblPersoon" into it.
9 Answers
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How can I clear the SQL Server query cache?
... (OPTIMIZE FOR UNKNOWN)
Then your query will be like this
select * from Table where Col = 'someval' OPTION (OPTIMIZE FOR UNKNOWN)
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What is the difference between CascadeType.REMOVE and orphanRemoval in JPA?
...nd it tells if the parent is removed, all its related records in the child table should be removed.
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