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postgresql - add boolean column to table set default
Is this proper postgresql syntax to add a column to a table with a default value of false
5 Answers
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creating a random number using MYSQL
...
pmin INTEGER,
pmax INTEGER
)
RETURNS INTEGER(11)
DETERMINISTIC
NO SQL
SQL SECURITY DEFINER
BEGIN
RETURN floor(pmin+RAND()*(pmax-pmin));
END;
and call like
SELECT myrandom(100,300);
This gives you random number between 100 and 300
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Close and Dispose - which to call?
Having read the threads Is SqlCommand.Dispose enough? and Closing and Disposing a WCF Service I am wondering for classes such as SqlConnection or one of the several classes inheriting from the Stream class does it matter if I close Dispose rather than Close?
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C/C++中的段错误（Segmentation fault） - C/C++ - 清泛网 - 专注C/C++及内核技术
...有个基本上对照的中文解释，来自http://www.linux999.org/html_sql/3/132559.htm
所谓的段错误 就是指访问的内存超出了系统所给这个程序的内存空间，通常这个值是由gdtr来保存的，他是一个48位的寄存器，其中的32位是保存由它...
Escape single quote character for use in an SQLite query
...ng the backslash character are not supported because they are not standard SQL. BLOB literals are string literals containing hexadecimal data and preceded by a single "x" or "X" character. ... A literal value can also be the token "NULL".
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How to delete from select in MySQL?
This code doesn't work for MySQL 5.0, how to re-write it to make it work
4 Answers
4
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How does TransactionScope roll back transactions?
...o enlist with it. Caution if there are more the one connection to the same SQL server this will escalate to a Distribtued Transaction.
What happens since you're using a using block you are ensuring dispose will be called even if an exception occurs. So if dispose is called before txScope.Complete(...
mysqli_fetch_assoc() expects parameter / Call to a member function bind_param() errors. How to get t
In my local/development environment, the MySQLi query is performing OK. However, when I upload it on my web host environment, I get this error:
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How to use transactions with dapper.net?
...n different system. This needs some configurations on operating system and SQL Server without which this will not work. This is not recommended if all your queries are against single instance of database.
But, with single database this may be useful when you need to include the code in transaction t...
“Insert if not exists” statement in SQLite
I have an SQLite database. I am trying to insert values ( users_id , lessoninfo_id ) in table bookmarks , only if both do not exist before in a row.
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