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Truncating all tables in a Postgres database
I regularly need to delete all the data from my PostgreSQL database before a rebuild. How would I do this directly in SQL?
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How to count occurrences of a column value efficiently in SQL?
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FYI, On SQL Server 2005, the second query runs with almost half the execution cost (using SET SHOWPLAN_ALL ON) as the first. I thought the first would have been better, but the old school join beat it.
– KM.
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Rails 4 LIKE query - ActiveRecord adds quotes
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Isn't this vulnerable to SQL Injection? I mean, are those search strings sanitized?
– jdscosta91
Oct 16 '14 at 17:08
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How to import CSV file data into a PostgreSQL table?
..._codes FROM '/path/to/csv/ZIP_CODES.txt' DELIMITER ',' CSV HEADER; postgresql.org/docs/9.1/static/sql-copy.html
– Barrett Clark
Nov 8 '13 at 15:17
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2016电商“死亡”名单（上半年） - 资讯 - 清泛网 - 专注IT技能提升
...业务曾扩展至北京、深圳、杭州等十多个城市，合作品牌包括赛百味、黄太吉等；2016年1月低调转型，上线电商平台最鲜到商城，通过众包物流与众包仓储相结合的方式提供“冷链存储”和“生鲜宅配”服务。
融资记录：A轮...
How can I create a copy of an Oracle table without copying the data?
... The command in my answer doesn't create the new table; it returns the SQL you would use to recreate the original table. You modify it as desired then run it. So the name of the new table is whatever you choose to specify.
– Dave Costa
Jul 18 '13 at 15:50...
Rails: Using greater than/less than with a where statement
... it possible for the user to enter the value, it avoids the possibility of SQL injection attacks)
– user1051849
Nov 4 '14 at 11:21
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Multiple Indexes vs Multi-Column Indexes
I've just been adding an Index to a table in SQL Server 2005 and it got me thinking. What is the difference between creating 1 index and defining multiple columns over having 1 index per column you want to index.
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使用App Inventor扩展实现多点触控：Scale Detector · App Inventor 2 中文网
...or.aix 扩展。 该扩展包含在源代码中。 通常，项目源文件包括项目使用的任何扩展名。
2、实现ScaleDetector扩展
上一节展示了如何使用提供的 ScaleDetector 扩展 aix 文件创建应用程序。 你还可以练习实现扩展本身。
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Database development mistakes made by application developers [closed]
...xists--you should be using it.
It's quite common to see this failure on MySQL databases. I don't believe MyISAM supports it. InnoDB does. You'll find people who are using MyISAM or those that are using InnoDB but aren't using it anyway.
More here:
How important are constraints like NOT NULL a...