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When it can be used:
1. Exact matches:
2. Using wild card character (% or _) at the end:
3. Less effective, bu...
7
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Order of the columns matter.
The index is useless if the first column doesn't appear in the WHERE clause.
Example 1:
An index on (t, x) will not be used in this query:
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Terminology:
How indexes work:
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49 reads
Wrapping the indexed column in a function nullifies the index almost completely.
Index:
CREATE INDEX e_idx ON users (email)
Query:
SELECT COUNT(*)
FROM users&...
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What is it?:
What is it good for?:
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105 reads
CURATED FROM
More like this
Terminology:
How indexes work:
Order of the columns matter.
The index is useless if the first column doesn't appear in the WHERE clause.
Example 1:
An index on (t, x) will not be used in this query:
Pandas is a Python language package, which is used for data processing. This is a very common basic programming library when we use Python language for machine learning programming. This article is an introductory tutorial to it. Pandas provide fast, flexible and expressive data structures with t...
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