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How to convert timestamp to datetime in MySQL?
...
You can use
select from_unixtime(1300464000,"%Y-%m-%d %h %i %s") from table;
For in details description about
from_unixtime()
unix_timestamp()
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Python Sets vs Lists
... due to near instant 'contains' checks: https://en.wikipedia.org/wiki/Hash_table
List implementation: usually an array, low level close to the metal good for iteration and random access by element index.
Set implementation: https://en.wikipedia.org/wiki/Hash_table, it does not iterate on a list, but...
Generate full SQL script from EF 5 Code First Migrations
... Does this create an exact copy of the database? Including the table contents?
– Multitut
Mar 20 '15 at 14:36
2
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How to check for Is not Null And Is not Empty string in SQL server?
...ause. As NULL will evaluate as UNKNOWN for these rather than TRUE.
CREATE TABLE T
(
C VARCHAR(10)
);
INSERT INTO T
VALUES ('A'),
(''),
(' '),
(NULL);
SELECT *
FROM T
WHERE C <> ''
Returns just the single row A. I.e. The row...
An efficient way to transpose a file in Bash
... interestingly it prints out a directory listing for the first line of the table. I don't know enough BASH to figure out why.
– bugloaf
Jun 19 '13 at 19:50
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Map enum in JPA with fixed values?
...t option (this is a basic implementation, tweak it as required):
@Entity
@Table(name = "AUTHORITY_")
public class Authority implements Serializable {
public enum Right {
READ(100), WRITE(200), EDITOR (300);
private int value;
Right(int value) { this.value = value; } ...
What does “hashable” mean in Python?
... data structures use the hash value internally.
All of Python’s immutable built-in objects are hashable, while no mutable containers (such as lists or dictionaries) are. Objects which are instances of user-defined classes are hashable by default; they all compare unequal, and their hash value...
Career day in kindergarten: how to demonstrate programming in 20 minutes? [closed]
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I've done this before.
I laid down a lot of paper towels on a table, and got out a loaf of (cheap) bread, a small tub of butter, a small jar of jelly, and a plastic butter knife.
I said to the kids, "How many of you think computers are smart?" Most of them raised their hands. I said,...
Why should you use an ORM? [closed]
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Making data access more abstract and portable. ORM implementation classes know how to write vendor-specific SQL, so you don't have to.
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LINQ to Entities does not recognize the method
...ect(iv => iv.ITEMNMBR.Trim()).ToList();
I added a .ToList() before my table, this decouple the Entity and linq code, and avoid my next linq expression be translated
NOTE: this solution isn't optimal, because avoid entity filtering, and simply loads all table into memory
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