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indexing

Can PostgreSQL index array columns?

by IT Nursery

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

Tags arrays, indexing, postgresql

Get index of selected option with jQuery

by IT Nursery

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

Tags HTML, indexing, jQuery, select

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

by IT Nursery

I have a list: a = [32, 37, 28, 30, 37, 25, 27, 24, 35, 55, 23, 31, 55, 21, 40, 18, 50, … Read more

Tags indexing, list, max, python

Why does PostgreSQL perform sequential scan on indexed column?

by IT Nursery

Very simple example – one table, one index, one query: CREATE TABLE book ( id bigserial NOT NULL, “year” integer, — other columns… … Read more

Tags database-scan, indexing, postgresql, sequence

How important is the order of columns in indexes?

by IT Nursery

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

Tags indexing, sql, sql-server, sql-server-2005, tsql

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

by IT Nursery

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

Tags indexing, lookup, pandas, performance, python

SQL Server Index Naming Conventions [closed]

by IT Nursery

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

Tags indexing, naming-conventions, sql-server

Postgres unique constraint vs index

by IT Nursery

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

Tags indexing, postgresql, sql, unique

Creating an index on a table variable

by IT Nursery

Can you create an index on a table variable in SQL Server 2000? i.e. DECLARE @TEMPTABLE TABLE ( [ID] [int] NOT NULL PRIMARY … Read more

Tags indexing, sql, sql-server, table-variable, tsql

How to Remove Array Element and Then Re-Index Array?

by IT Nursery

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

Tags arrays, indexing, php
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