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Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...原理：
当用户通过extmail登陆时，首先extmail先去通过mysql进行虚拟用户认证，当认证通过时，postfix通过Cyrus-SASL这个函数库，这个认证框架，结合Courier-authlib对发信人进行认证，通过检索Mysql数据库中的数据来进行认证，以此来...
MySQL combine two columns into one column
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My guess is that you are using MySQL where the + operator does addition, along with silent conversion of the values to numbers. If a value does not start with a digit, then the converted value is 0.
So try this:
select concat(column1, column2)
Two ways ...
Targeting both 32bit and 64bit with Visual Studio in same solution/project
...istered in the GAC, you can also use the standard reference tags this way (SQLite as an example):
<ItemGroup Condition="'$(Platform)' == 'x86'">
<Reference Include="System.Data.SQLite, Version=1.0.80.0, Culture=neutral, PublicKeyToken=db937bc2d44ff139, processorArchitecture=x86" />
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How can I get the actual stored procedure line number from an error message?
When I use SQL Server and there's an error, the error message gives a line number that has no correlation to the line numbers in the stored procedure. I assume that the difference is due to white space and comments, but is it really?
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Does the join order matter in SQL?
... In fact, all join types are associative, as specified by the SQL standard and according to mathematical definitions of associativity, but they don't appear associative because rearranging the parentheses requires moving the ON clause (i.e. the "join specification") to a new location. T...
SQLite add Primary Key
I created a table in Sqlite by using the CREATE TABLE AS syntax to create a table based on a SELECT statement. Now this table has no primary key but I would like to add one.
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Select all columns except one in MySQL?
...rying to use a select statement to get all of the columns from a certain MySQL table except one. Is there a simple way to do this?
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Get the new record primary key ID from MySQL insert query?
Let's say I am doing a MySQL INSERT into one of my tables and the table has the column item_id which is set to autoincrement and primary key .
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Replace duplicate spaces with a single space in T-SQL
I need to ensure that a given field does not have more than one space (I am not concerned about all white space, just space) between characters.
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SQL Server Output Clause into a scalar variable
....new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f5558582%2fsql-server-output-clause-into-a-scalar-variable%23new-answer', 'question_page');
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