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Mysql substr和Oracle substr区别 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术

Mysql substr和Oracle substr区别Oracle substr(字符串,开始索引、从0起,长度)Mysql substr或substring(字符串,开始索引、从1起,长度)Oracle substr(字符串,开始索引、从0起,长度) Mysql substr或substring(字符串,开始索引、从1起,长度)Mysql Orac...
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mysql实现split分割字符串(length, SUBSTRING_INDEX, substring) - 数据...

mysql实现split分割字符串(length, SUBSTRING_INDEX, substring)由于MySql没有直接的split函数,只提供了length, SUBSTRING_INDEX, substring三个函数,这里介绍如何用这三个函数实现split功能。# SUBS...由于MySql没有直接的split函数,只提供了length, SUB...
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PHP学习必看的一些书 - IT书籍推荐 - 清泛网 - 专注C/C++及内核技术

...不错,对于框架介绍和开发来说 数据库相关(主要是Mysql) 《MySQL必知必会》 –极好的MySQL语法参考书 《深入浅出MySQL——数据库开发、优化与管理维护》 –很多实用的MySQL技巧 《MySQL性能调优与架构设计》 –关...
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PHP学习必看的一些书 - PHP - 清泛IT论坛,有思想、有深度

...还不错,对于框架介绍和开发来说 数据库相关(主要是Mysql)《MySQL必知必会》 –极好的MySQL语法参考书《深入浅出MySQL——数据库开发、优化与管理维护》 –很多实用的MySQL技巧《MySQL性能调优与架构设计》 –关于很多架构和...
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MySQL date format DD/MM/YYYY select query?

... You can use STR_TO_DATE() to convert your strings to MySQL date values and ORDER BY the result: ORDER BY STR_TO_DATE(datestring, '%d/%m/%Y') However, you would be wise to convert the column to the DATE data type instead of using strings. ...
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Best data type for storing currency values in a MySQL database

What is the best SQL data type for currency values? I'm using MySQL but would prefer a database independent type. 9 Answer...
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How to get the mysql table columns data type?

I want to get the column data type of a mysql table. 11 Answers 11 ...
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Include all existing fields and add new fields to document

... You can use $$ROOT to references the root document. Keep all fields of this document in a field and try to get it after that (depending on your client system: Java, C++, ...) [ { $project: { custom_field: "$obj.ob...
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How to pass arguments to a Button command in Tkinter?

... Example GUI: Let's say I have the GUI: import tkinter as tk root = tk.Tk() btn = tk.Button(root, text="Press") btn.pack() root.mainloop() What Happens When a Button Is Pressed See that when btn is pressed it calls its own function which is very similar to button_press_handle in t...
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MySQL Data - Best way to implement paging?

My iPhone app connects to my PHP web service to retrieve data from a MySQL database. A request can return 500 results. 7 An...