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Questions - clustered-index

If primary key is clustered index in a table then the other columns are eg any unique column is a table is non clustered?

CREATE TABLE people( personID int, FirstName VARCHAR(255), LastNanme VARCHAR(255), Address VARCHAR(255), City VARCHAR(255) PRIMARY KEY (PERSONID) );
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Saket khatavkar

mysql

mysql-workbench

primary-key

clustered-index

non-clustered-index

Votes: 0

Answers: 1

Latest Answer

Yes, a given table can only have one clustered index, and in InnoDB, it is always the primary key. All other indexes on that table are non-clustered. The clustered index also stores all the columns of...
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Bill Karwin

Plot number of tickets opened and closed by month in R

I have a list of tickets and I would to create a graph to show how many opened and closed by month. Every ticket item has 2 data points: opened_at date and closed_at date. I want to create a clustered...
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Marcelo Bastos

r

ggplot2

clustered-index

Votes: 0

Answers: 0

Unique clustered index vs primary key

I have a table with composite primary key of 7 fields, but table is allowing duplicate entries with primary key. Later I noticed it also has Unique clustered index with 10 fields including 7 of primar...
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Ashish Dubey

sybase

composite-primary-key

clustered-index

Votes: 0

Answers: 1

Latest Answer

Peformance-wise, clustered key, set correctly (aka does not include all fields you deem unique), gives you the most advantage. 7-column PK is a strange construct; if you need to guard uniqueness, I wo...
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access_granted

When we create a clustered index does it takes extra space?

I am asking this question with repect to mysql database.I read that clustered index orders the table based on primary key or columns that we provide for making clustered index, where as in non cluster...
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PING

mysql

rdbms

clustered-index

non-clustered-index

Votes: 0

Answers: 2

Latest Answer

There is no extra space taken because every InnoDB table is stored as the clustered index. There is in fact only the clustered index, and secondary indexes. There's no separate storage for data, becau...
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Bill Karwin

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