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indexing

arrays, Programming

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Can PostgreSQL index array columns?

I can’t find a definite answer to this question in the documentation. If a column is an array type, will all the entered ...

June 2, 2022
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jquery, Programming

IT Nursery

Get index of selected option with jQuery

I’m a little bit confused about how to get an index of a selected option from a HTML <select> item. On this page ...

June 1, 2022
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Programming, Python

IT Nursery

How to find all positions of the maximum value in a list?

I have a list: a =...

May 31, 2022
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postgresql, Programming

IT Nursery

Why does PostgreSQL perform sequential scan on indexed column?

Very simple example – one table, one index, one query: CREATE TABLE book ( id bigserial NOT NULL, "year" integer, -- other columns... ...

May 30, 2022
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Programming, sql

IT Nursery

How important is the order of columns in indexes?

I’ve heard that you should put columns that will be the most selective at the beginning of the index declaration. Example: CREATE NONCLUSTERED ...

May 30, 2022
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Programming, Python

IT Nursery

pandas loc vs. iloc vs. at vs. iat?

Recently began branching out from my safe place (R) into Python and and am a bit confused by the cell localization/selection in Pandas. ...

May 29, 2022
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Programming, sql-server

IT Nursery

SQL Server Index Naming Conventions [closed]

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, ...

May 28, 2022
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Programming, sql

IT Nursery

Postgres unique constraint vs index

As I can understand documentation the following definitions are equivalent: create table foo ( id serial primary key, code integer, label text, constraint ...

May 27, 2022
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Programming, sql

IT Nursery

Creating an index on a table variable

Can you create an index on a table variable in SQL Server 2000? i.e. DECLARE @TEMPTABLE TABLE ( [ID]...

May 27, 2022
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How to Remove Array Element and Then Re-Index Array?

I have some troubles with an array. I have one array that I want to modify like below. I want to remove element ...

May 26, 2022
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