index tag

10 questions


1 answers
103 views
0
I'm making a chat like Kakao Talk with MySQL, but the query is extremely slow depending on the number of LIMITs

Hello. Like Kakao Talk, we are implementing a chat that shows the past conversation when you look up while looking at the recent conversation.SELECT * FROM chat WHERE user_id = user ID order by chat_i...

2 years ago

1 answers
94 views
0
I'm curious about the theory of ORACLE INDEX.

I'm studying about indexes.It's a source that compares indexes with those using DML I have a few questions.create table emp3( no number, name varchar2(10), salary number ); insert into emp3 values (1,...

2 years ago

2 answers
113 views
0
I'm going to use div to make it seem like I'm connecting multiple divs

Link name I'm I'm implementing this draft...That circle is all div, and the image is included in the div tag.At the same time, in order to display text on the image, the text was floated above using z...


1 answers
71 views
0
Python] When converting from Korean column name -> multiindex to English index name, DataFrame cannot find English index name... (DataFrame' object has no attribute 'English index name')

By material code To see how much of the material has been used over a given period of time, ex)January 1st to January 31stPivot raw data and pivot_Data = pd.pivot_table (rawData, index = ['material co...

2 years ago

1 answers
90 views
0
I want to use the class for the values in the list (add code and error message)

a = class()b = class()c = class()..z = closs()In order to use the class, you must enter Instance = Class(). In this way, I didn't type in from a to z one by one, but I made a list and made a repeat se...

2 years ago

2 answers
93 views
0
Ask questions when you repeatedly insert or delete from the python list.

If you use for loop in Python to remove data repeatedly,I'd like to solve the case where I can't find the desired result because I already erased the data while looping.data= [1, 2, 3, 4, 5, 6]for i i...

2 years ago

3 answers
118 views
0
Python Double List Index Value Import Question

I want to find the index of the value entered in n in the puzzle list below, but after 1, 2, 3, and 4 in the first list, the error keeps occurring.index = puzzle[i].index(n) This part seems strange, b...

2 years ago

1 answers
140 views
0
Questions about setting up Python Dictionary!

name = [Gayeon, Nayeon, Dayeon, ...., Hayeon]test1 = [20, 98, ..., 86]test2 = [50, 39, ...,39]and How do I set the name to key and test1, test2 to value in the function info??I want to bundle the valu...

2 years ago

2 answers
122 views
0
Error when specifying variable for index of empty double array using for loop - JavaScript

testOne = [['ex','ex','ex'],['ex','ex','ex'],['ex','ex','ex'],['ex','ex','ex'],['ex','ex','ex'],];xx = [];realCal = ['a','b','c']; for (let i = 0; i < testOne.length; i++) { xx[i] = realCal; xx...


1 answers
153 views
0
Python list method index question, find the last element in the list.

The language is Python.I have a question about using index method, which is one of Python's methods.For example,When a_list=[1,2,3,1,4],If you use the index method, you will first put 0 which is the i...

2 years ago

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