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Questions - indexing

Import-csv, column name has multiple lines - how do I access data

I have an excel file I convert to csv, and use this to import the data. For some reason, I can't get the data for the sdk column, maybe because it has a line break in the name. This is what the csv l...
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Michele

powershell

indexing

row

import-csv

Votes: 0

Answers: 0

Associating an index with a query in MongoDB?

If there are multiple indexes for a given collection, what determines which index is used when a query is submitted? Can the query submitter select which index to use? If so, how?
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Bear Bile Farming is Torture

mongodb

indexing

backend

b-tree

Votes: 0

Answers: 1

Latest Answer

MongoDB uses a query planner to automatically select an index. You can view the options considered for a query with the explain command. Use hint to force the index to use.
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Joe

can indexing SQL tables improve the performance of a tableau dashboard?

I have a very high level question. could indexes on a sql server table improve the loading performance of a tableau dashboard? if so - is there any best practice / guideline we could follow? thanks a ...
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Sergio Tagliaferri

sql

indexing

tableau-desktop

Votes: 0

Answers: 2

Latest Answer

An index will speed up the extraction of the data to Tableaus database structure, but it will not speed up Tableau as you interact with it. There is a Tableau community website where you can find bes...
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BobbyW

MariaDB: Using PK for inner query result

I have three tables (MariaDB 10.6.5): person, private_person and corporate_person. In the person are Ids stored, in the other tables are names stored, both connected to the person per FK: CREATE TABLE...
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Dave_B.

mysql

indexing

mariadb

subquery

query-optimization

Votes: 0

Answers: 2

Latest Answer

It's the OR operations that doom your query. WHERE `p0`.`FirstName` = 'Test' OR p0.LastName = 'Test' OR `c0`.`Name` = 'Test'; This is a common problem with query optimization, given that MySQL uses...
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Bill Karwin

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