在 PSQL 中忽略大小写的 AS 语句

Question

We are using the Node Postgres client to run some queries on our database, like:

await client.query('SELECT A.date_time AS dateTime FROM A')

the problem is that returned value for the row comes as:

Expected:{
  dateTime: '2009-06-16 11:00:00'
}

Received: {
  datetime: '2009-06-16 11:00:00'
}

is this a bug or are we missing a configuration somewhere?

Answer 1

SQL is case sensitive, but everything that is not a string literal or a quoted identifier is case folded . The SQL standard prescribes case folding to upper case, but PostgreSQL folds to lower case.

If you want case to be preserved in an identifier like dateTime , you have to surround it with double quotes: "dateTime"