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How can I change the table names when using ASP.NET Identity?
...ers" you can also change the field names the default Id column will become User_Id.
modelBuilder.Entity<IdentityUser>()
.ToTable("Users", "dbo").Property(p => p.Id).HasColumnName("User_Id");
or simply the below if you want to keep all the standard column names:
model...
PostgreSQL Autoincrement
...any other integer data type, such as smallint.
Example :
CREATE SEQUENCE user_id_seq;
CREATE TABLE user (
user_id smallint NOT NULL DEFAULT nextval('user_id_seq')
);
ALTER SEQUENCE user_id_seq OWNED BY user.user_id;
Better to use your own data type, rather than user serial data type.
...
When to use std::size_t?
...
@EntangledLoops ssize_t does not have the full range of size_t. It just is the signed variant of whatever size_t would translate into. This means, that the full range of the memory is not usable with ssize_t and integer overflows could happen when depending on variables o...
Why do we have to normalize the input for an artificial neural network?
...
Some inputs to NN might not have a 'naturally defined' range of values. For example, the average value might be slowly, but continuously increasing over time (for example a number of records in the database).
In such case feeding this raw value into your network will not work v...
What is the difference between .text, .value, and .value2?
... Format to control how the number gets converted to a string: var = Format(Range("a1").Value2, "#")
– Charles Williams
Jan 22 '15 at 13:16
2
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Joining three tables using MySQL
...
SELECT *
FROM user u
JOIN user_clockits uc ON u.user_id=uc.user_id
JOIN clockits cl ON cl.clockits_id=uc.clockits_id
WHERE user_id = 158
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...
How can I read inputs as numbers?
...
n=int(input())
for i in range(n):
n=input()
n=int(n)
arr1=list(map(int,input().split()))
the for loop shall run 'n' number of times . the second 'n' is the length of the array.
the last statement maps the integers to a list and takes i...
Index on multiple columns in Ruby on Rails
... its columns in sequence starting at the beginning. i.e. if you index on [:user_id, :article_id], you can perform a fast query on user_id or user_id AND article_id, but NOT on article_id.
Your migration add_index line should look something like this:
add_index :user_views, [:user_id, :article_id...
How to get ID of the last updated row in MySQL?
...sers set status = 'processing' where status = 'pending'
and last_insert_id(user_id)
limit 1
The addition of last_insert_id(user_id) in the where clause is telling MySQL to set its internal variable to the ID of the found row. When you pass a value to last_insert_id(expr) like this, it ends up ret...
Create unique constraint with null columns
... two partial indexes:
CREATE UNIQUE INDEX favo_3col_uni_idx ON favorites (user_id, menu_id, recipe_id)
WHERE menu_id IS NOT NULL;
CREATE UNIQUE INDEX favo_2col_uni_idx ON favorites (user_id, recipe_id)
WHERE menu_id IS NULL;
This way, there can only be one combination of (user_id, recipe_id) whe...