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Is there a MySQL option/feature to track history of changes to records?
I've been asked if I can keep track of the changes to the records in a MySQL database. So when a field has been changed, the old vs new is available and the date this took place. Is there a feature or common technique to do this?
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What does “opt” mean (as in the “opt” directory)? Is it an abbreviation? [closed]
What does "opt" mean (as in the "opt" directory)? I commonly see this directory in Unix systems with development tools inside.
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SQL to find the number of distinct values in a column
I can select all the distinct values in a column in the following ways:
11 Answers
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'Operation is not valid due to the current state of the object' error during postback
I had an aspx page which was working well, but suddenly I am getting the error "Operation is not valid due to the current state of the object." whenever a postback is done.
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Extracting hours from a DateTime (SQL Server 2005)
I can extract the month and day by using Day(Date()) , Month(Date()) . I can't extract hours, with HOUR(Date()) . I get the following error.
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财务计算器拓展：复利计算、平均值、中位数、众数、方差计算 - App Invento...
Financial Calculator Extension
精心打造的“财务计算器”扩展，为您的Android应用程序增添先进的财务和统计功能。此扩展让您能够执行广泛的财务计算，从简单利息和复利到净现值和投资回报率。它还使您能够进行基本的统计计算...
CodeIgniter activerecord, retrieve last insert id?
Are there any options to get the last insert id of a new record in CodeIgniter?
11 Answers
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High performance fuzzy string comparison in Python, use Levenshtein or difflib [closed]
I am doing clinical message normalization (spell check) in which I check each given word against 900,000 word medical dictionary. I am more concern about the time complexity/performance.
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How to get the browser to navigate to URL in JavaScript [duplicate]
What is the best (correct, modern, cross-browser, safe) way to get a web browser to navigate to a URL of your choice using JavaScript?
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App Inventor 2 CirculBar 扩展：在图像组件上绘制自定义圆形进度条 · App Inventor 2 中文网
.navbar .nav-link .mdi, .navbar .dropdown-item .mdi { margin-right: 6px; opacity: .7; } 创建 Apps 文档 文档首页 内置块参考文档 组件参考文档 拓展参考文档 概念参考文档 IoT 参考文档 技术和其他指...