maria-discuss team mailing list archive

[Roberto Spadim <roberto@xxxxxxxxxxxxx>]

Hi guys! There's a "easy/fast" way to rewrite a query from this:

Select datetime,key,value from table where ...

To this:

Select datetime, value1 as key1, value2 as key2, .... From table where ...

I don't remember the right name in R/python (pandas) language but it's
something like vector/matrix merge

The ideia is, instead of one line of date key vale, use a single date, and
"put" values as columns, and the columns name is the key name

The table structure is something like:
Create table (
Datetime datetime not null,
Key varchar(255) not null,
Value double not null,
Primary key(datetime,key)
)

Any idea is wellcome
I know there's many solutions, if i have >100 columns, if datetime is
sparse (only one key have values per datetime value), etc etc


-- 
Roberto Spadim
SPAEmpresarial - Software ERP
Eng. Automação e Controle