SQL:aggiungi una colonna con ID incrementale a SELECT

Usa ROW_NUMBER() :

SQLFiddle

SELECT 
  name,
  ROW_NUMBER() OVER (ORDER BY name) AS id
FROM people;

MODIFICA:

Differenza tra ORDER BY 1 vs ORDER BY column_name

SQLFiddleDemo

SELECT 
    name,
    ROW_NUMBER() OVER (ORDER BY name) AS id
FROM people;

/* Execution Plan */
QUERY PLAN WindowAgg (cost=83.37..104.37 rows=1200 width=38)
-> Sort (cost=83.37..86.37 rows=1200 width=38)
**Sort Key: name**
-> Seq Scan on people (cost=0.00..22.00 rows=1200 width=38)

SELECT 
    name,
    ROW_NUMBER() OVER (ORDER BY 1) AS id
FROM people;

/* Execution Plan */
QUERY PLAN WindowAgg (cost=0.00..37.00 rows=1200 width=38)
-> Seq Scan on people (cost=0.00..22.00 rows=1200 width=38)

Nel secondo caso non c'è alcuna operazione di ordinamento.

Puoi anche scrivere la seconda query come:

SELECT 
    name,
    ROW_NUMBER() OVER () AS id
FROM people;

Perché le persone scrivono ORDER BY 1 nelle funzioni in finestra?

Perché in alcuni dialetti è obbligatorio e ORDER BY 1 agisce come segnaposto.

Oracolo:

SELECT 
  name,
  ROW_NUMBER() OVER (ORDER BY 1) AS id
FROM people;

TSQL:

SELECT 
    name,
    ROW_NUMBER() OVER (ORDER BY (SELECT 1)) AS id
FROM people;