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How to debug PDO database queries?
...ments to Rails, but that the benefit is much heavier in PostgreSQL than in MySQL. He said that this is because MySQL doesn't actually create the query plan until you execute the prepared query.
– Nathan Long
Jul 20 '11 at 13:46
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How do I check to see if a value is an integer in MySQL?
I see that within MySQL there are Cast() and Convert() functions to create integers from values, but is there any way to check to see if a value is an integer? Something like is_int() in PHP is what I am looking for.
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Importance of varchar length in MySQL table
I have a MySQL table where rows are inserted dynamically. Because I can not be certain of the length of strings and do not want them cut off, I make them varchar(200) which is generally much bigger than I need. Is there a big performance hit in giving a varchar field much more length than necessar...
使用虚拟现实和App Inventor进行实验 · App Inventor 2 中文网
...Google 商店以查找各种 Cardboard 查看器，或在网上搜索有关如何制作自己的 Cardboard 查看器的提示。您还可以使用 Cardboard 以外的查看器。
Expeditions
Expeditions 演示显示沉浸式 360 度全景图。Google 于 2014 年在 Google I/O 2014 的主题演讲...
Include all existing fields and add new fields to document
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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...
How to pass arguments to a Button command in Tkinter?
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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...
How to subtract 30 days from the current datetime in mysql?
How do I subtract 30 days from the current datetime in mysql?
8 Answers
8
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Is it a good idea to index datetime field in mysql?
...etime clause to select data. Is it a good idea to index datetime fields in mysql database?
2 Answers
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Dropping Unique constraint from MySQL table
How can I drop the "Unique Key Constraint" on a column of a MySQL table using phpMyAdmin?
10 Answers
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Maximum length of a table name in MySQL
What is the maximum length of a table name in MySQL?
4 Answers
4
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