Bristol | 模拟 MySQL 从库 , 实时解析 MySQL Binlog 的简单易用的库
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Top functions reviewed by kandi - BETA
- fieldTypeName returns the field type name for the given field type .
- readInitPacket reads the next packet .
- readLengthEncodedInt reads number integer value from buf .
- parseDSN parses dsn from dsn
- CheckBinlogIsRight check position of a file
- bytesToLengthCodedBinary returns the length of a byte slice .
- marshalPassword computes the hash of the given password .
- Read a binary datetime 2
- GetNearestRightBinlog gets the nearest position in a binlog
- NewBinlogDump creates a new BinlogDump
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QUESTION
I'm trying to join array elements in BigQuery but I am getting the following error message:
Correlated subqueries that reference other tables are not supported unless they can be de-correlated, such as by transforming them into an efficient JOIN.
In my first table I have something like:
field1 | field2 | some_list
Elements in some_list have ids and other data and I'd like to enrich each element from some_list with some fields from a different table (they may exist or not).
I've tried to unnest some_list and left join with a different table on id but it seems it's not allowed.
Any ideas how I can do it? Thanks!
First table:
...ANSWER
Answered 2021-Jun-14 at 12:24This should work just fine and it seem to do what you are describing:
QUESTION
I am working on a data table that talks about streets consisting of a single column. Each street is a block of rows of variable length The first line contains the name of the street, and the others lines various details Each street is separated from another street by a cell containing 4 stars. How do I reorganize my data?
...ANSWER
Answered 2021-Jun-08 at 12:37Here's one option using tidyverse
-
QUESTION
So, I've a command set on my bot that whenever someone types "/planeidea" it sends the name of a plane, however, i've like 300 lines of names of planes. (I reduced it, so you can see an example of what im talking about). What i wanna do is make a .txt file and place all the names of the planes instead of having it in the main code.
...ANSWER
Answered 2021-May-18 at 02:09Alright, so you can just create a plain text file, for my example, I'll just use planes.txt
. Inside planes.txt
, I can just list my planes line by line with no quotations or commas:
QUESTION
My goal here is to make a geodataframe from a couple of columns of coordinates in an existing dataframe, take those 1677 geographic points and add a buffer circle around each, then union the resulting polygons into a multipolygon. Where I keep getting wrapped around the axle is the .buffer() part of geopandas doesn't seem to be using the units of measure for the CRS I've selected.
...ANSWER
Answered 2021-May-05 at 09:23GeoPandas does exactly what is expected to do. You have to re-project your geometries to a target CRS, simply assigning it does not do anything.
When creating the GeoDataFrame, make sure you specify in which CRS your data is. In this case it is EPSG:4326 aka geographical projection in degrees.
QUESTION
I'm trying to create a journey booking system in python/flask and am trying to create a dict of starting destinations and their ending destinations to allow me to run some ajax code which restricts the options of selecting destination based on the starting location like this (this is just an example of what I'm trying to create, not exactly the values I want):
...ANSWER
Answered 2021-Apr-29 at 01:15You can use collections.defaultdict
:
QUESTION
I am trying to create a subset of a data frame based on a range surrounding the values of a second data frame, I've been researching but I just cannot figure out how to go about it. I've used dummy data here as they are both large datasets with many columns.
Data Frame 1 (df1) has 50 columns, thousands of recordings at different Latitudes
Recording Latitude BombusL 51.41 ApisM 51.67 BombusR 51.34Data Frame 2 (df2) has several hundred towns all at different latitudes, it is significantly smaller than df1
Town Lat Bristol 51.40 Merton 51.42 Horsham 51.33I need a subset of df1 which only includes rows with latitudes that are within 0.01 of a latitude in df2. So the code needs to look down every row of df1 and test that number against every row of df2. The output would include only rows from df1 where the latitude value is within 0.01 range of a value in df2$Latitude.
From the example, the following lines would be included
Recording Latitude BombusL 51.41 BombusR 51.34I have the start of the code to do a filter that I could then run through the data frame to create the subset
...ANSWER
Answered 2021-Apr-28 at 18:54When there is precision involved (i.e. adding or subtracting 0.01, it is a floating point number), it may be better to use comparison operators instead of fixed matching
QUESTION
I am using SQL Server 2014 and I have the following T-SQL query running against a table (tbl1).
Extract of tbl1:
...ANSWER
Answered 2021-Apr-04 at 05:13I think you want DENSE_RANK
here rather than ROW_NUMBER()
:
QUESTION
I am having difficulty in trying to pull the href from a website. I have been stuck on it for a few days nows. As the image below shows I can get all the other required information. I have tried several variations for the class as well as trying to get it via the a
Tag, however I can not work it out.
This is my latest attempt, still can not work it out
Question, Can someone please point out the correct Class?
...ANSWER
Answered 2021-Apr-01 at 14:48It ok, I have fixed the issue. I changed the parent class to Set elements = HTML.getElementsByClassName("search-page__result")
Then changed my code to
QUESTION
I am doing Exploratory Data Analytics of Sports Data using R Programming... I want to print the records from the Data Frame based on two condition condition : Country == "England" ||(OR operator) Ground == ground can be any one from the below list
...ANSWER
Answered 2021-Mar-20 at 23:34Does
subset(WC_Grounds, WC_Grounds$Country=="England" | WC_Grounds$Ground %in% WC_Grounds_List)
Work for you?
|| and && - These operators are “short-circuiting”: as soon as || sees the first TRUE it returns TRUE without computing anything else. You should instead use
|
which is vectorized thus applying to the multiple values in your dataset.
Here is an example using the abbreviated sample data I added to your question:
QUESTION
I have a csv list of towns that contains the town,county,country. I removed the headers for the sake of not having to do so in the coding.
Here is what I have:
...ANSWER
Answered 2021-Mar-11 at 02:05I added test data to your example csv since it only had 1 county:
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