大约有 40,000 项符合查询结果（耗时：0.0589秒） [XML]
C# equivalent to Java's charAt()?
I know we can use the charAt() method in Java get an individual character in a string by specifying its position. Is there an equivalent method in C#?
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SQL- Ignore case while searching for a string
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Use something like this -
SELECT DISTINCT COL_NAME FROM myTable WHERE UPPER(COL_NAME) LIKE UPPER('%PriceOrder%')
or
SELECT DISTINCT COL_NAME FROM myTable WHERE LOWER(COL_NAME) LIKE LOWER('%PriceOrder%')
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LINQ to SQL: Multiple joins ON multiple Columns. Is this possible?
... from child in context.Childs
where child.Parent.col2 == 4
select new
{
childCol1 = child.col1,
parentCol1 = child.Parent.col1,
};
will generate the query
SELECT [t0].[col1] AS [childCol1], [t1].[col1] AS [parentCol1]
FROM [dbo].[Child] AS [...
Strings as Primary Keys in SQL Database [closed]
... Also keep in mind that there's often a very big difference between a CHAR and a VARCHAR when doing index comparisons
– Tom H
Feb 5 '09 at 20:42
7
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SQLite: How do I save the result of a query as a CSV file?
... file output.
sqlite> .mode csv
sqlite> .output test.csv
sqlite> select * from tbl1;
sqlite> .output stdout
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How to set Sqlite3 to be case insensitive when string comparing?
I want to select records from sqlite3 database by string matching. But if I use '=' in the where clause, I found that sqlite3 is case sensitive. Can anyone tell me how to use string comparing case-insensitive?
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How to generate a random number in C++?
...me(CLOCK_REALTIME, &tm);
return tm.tv_nsec;
}
int main (int argc, char* argv[]) {
unsigned int dice_rolls = 12;
random::mt19937 rng(current_time_nanoseconds());
random::uniform_int_distribution<> six(1,6);
for(unsigned int i=0; i<dice_rolls; i++){
cout <...
How do I clone a job in Jenkins?
...u can clone a job:
Click on 'New Item' link
Give a new name for your job
Select radio button 'Copy existing Item'
Give the job name that you want to clone
Click 'OK'
Finally, you have your new job, which reflects all features of your cloned one.
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How to log PostgreSQL queries?
...ement = 'all'
#logging_collector = off to logging_collector = on
Optional: SELECT set_config('log_statement', 'all', true);
sudo /etc/init.d/postgresql restart or sudo service postgresql restart
Fire query in postgresql select 2+2
Find current log in /var/lib/pgsql/9.2/data/pg_log/
The log files t...
How to check if a string “StartsWith” another string?
... @cobbal Maybe. But .lastIndexOf(input, 0) compares the first N chars, whereas .substring(0, input.length) === input counts N, substrings the data to N length, and then compares those N chars. Unless there is code optimization, this second version cannot be faster than the other. Don't ge...