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 … Read more
indexing
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 … Read more
How to find all positions of the maximum value in a list?
I have a list: a = [32, 37, 28, 30, 37, 25, 27, 24, 35, 55, 23, 31, 55, 21, 40, 18, 50, … Read more
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… … Read more
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 … Read more
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. … Read more
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, … Read more
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 … Read more
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] [int] NOT NULL PRIMARY … Read more
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 … Read more