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Linq to Sql: Multiple left outer joins
...rouble figuring out how to use more than one left outer join using LINQ to SQL. I understand how to use one left outer join. I'm using VB.NET. Below is my SQL syntax.
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How to list the tables in a SQLite database file that was opened with ATTACH?
What SQL can be used to list the tables, and the rows within those tables in an SQLite database file - once I have attached it with the ATTACH command on the SQLite 3 command line tool?
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Are Databases and Functional Programming at odds?
...database level not through the user interface), performance, and security. SQL is written to manage the first two considerations more effectively than any front end language. Because it is specifically designed to do that. The task of a database is far different than the task of a user interface. Is...
Inserting a Python datetime.datetime object into MySQL
I have a date column in a MySQL table. I want to insert a datetime.datetime() object into this column. What should I be using in the execute statement?
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Wi-Fi 是什么的缩写 - 创意 - 清泛网 - 专注C/C++及内核技术
...列表。
Interbrand 当初提交的十三个方案，除了 Wi-Fi，还包括：
Skybridge
Torchlight
Flyover
Transpeed
Elevate
Trapeze
Dragonfly
Hornet
在首轮投票中，Wi-Fi 并不是最高分数，分数最高的依次为：Trapeze（飞人）、Dragonfly（蜻蜓）、Hornet...
INNER JOIN ON vs WHERE clause
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It's easier to see this with the WHERE syntax.
As for your example, in MySQL (and in SQL generally) these two queries are synonyms.
Also note that MySQL also has a STRAIGHT_JOIN clause.
Using this clause, you can control the JOIN order: which table is scanned in the outer loop and which one is i...
mysqldump data only
I am looking for the syntax for dumping all data in my mysql database. I don't want any table information.
8 Answers
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海量数据相似度计算之simhash和海明距离 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...头说过的吗，要把文章变为数字计算才能提高相似度计算性能，现在是降维过程进行时。
3、加权，通过 2步骤的hash生成结果，需要按照单词的权重形成加权数字串，比如“美国”的hash值为“100101”，通过加权计算为“4 -4 -4...
MySQL OPTIMIZE all tables?
MySQL has an OPTIMIZE TABLE command which can be used to reclaim unused space in a MySQL install. Is there a way (built-in command or common stored procedure) to run this optimization for every table in the database and/or server install, or is this something you'd have to script up yourself?
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How to add new column to MYSQL table?
I am trying to add a new column to my MYSQL table using PHP. I am unsure how to alter my table so that the new column is created. In my assessment table I have:
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