大约有 6,100 项符合查询结果（耗时：0.0501秒） [XML]
Validate uniqueness of multiple columns
...record is unique and not just a column? For example, a friendship model / table should not be able to have multiple identical records like:
...
LINQ to Entities does not recognize the method 'System.String ToString()' method, and this method ca
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It's true this method would be inefficient for any table that contains more than one record, meaning all tables in existence :-). However, this answer did help me today because I was doing a .Select projection that included toString() so calling .ToList() before hand had no ...
SQLAlchemy IN clause
...Without the ORM, it would be
session.execute(
select(
[MyUserTable.c.id, MyUserTable.c.name],
MyUserTable.c.id.in_((123, 456))
)
).fetchall()
select() takes two parameters, the first one is a list of fields to retrieve, the second one is the where condition. You can acce...
Pull to refresh UITableView without UITableViewController
I'm trying to implement a pull to refresh feature in a UITableView within a UIViewController. I can't use a UITableViewController because I want the UITableView to be a smaller subview in the view controller, with some other stuff above it. I assume this is possible, but has anyone seen an implement...
Convert INT to VARCHAR SQL
...
Use the convert function.
SELECT CONVERT(varchar(10), field_name) FROM table_name
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MySQL load NULL values from CSV data
... up containing an empty string:
LOAD DATA INFILE '/tmp/testdata.txt'
INTO TABLE moo
FIELDS TERMINATED BY ","
LINES TERMINATED BY "\n"
(one, two, three, @vfour, five)
SET four = NULLIF(@vfour,'')
;
If they're all possibly empty, then you'd read them all into variables and have multiple SET stateme...
Any good boolean expression simplifiers out there? [closed]
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Note that if you want the truth table, which is not always outputed for some expressions, then start the query with the words "truth table" followed by the expression
– Belgi
May 20 '17 at 13:00
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Load data from txt with pandas
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Thanks! How can I access an element of the table?
– albus_c
Feb 4 '14 at 7:57
if you w...
How can you integrate a custom file browser/uploader with CKEditor?
... html,
body {padding:0; margin:0; background:black; }
table {width:100%; border-spacing:15px; }
td {text-align:center; padding:5px; background:#181818; }
img {border:5px solid #303030; padding:0; verticle-align: middle;}
img:hover { border-color:blu...
View contents of database file in Android Studio
...-db-name>.db
6- run sqlite3 commands that you like eg:
Select * from table1 where ...;
Note: Find more commands to run below.
SQLite cheatsheet
There are a few steps to see the tables in an SQLite database:
List the tables in your database:
.tables
List how the table looks:
.schem...