[TimLFletcher]

Fixes DOC-13905.

What changed

modules/learn/pages/data/n1ql-versus-sql.adoc, in Data Selection. Three examples put nested access in the FROM clause and selected the alias, which is the inversion of how {sqlpp} works.

-  SELECT FullTime FROM HRData.Status
+  SELECT Status.FullTime FROM HRData

-SELECT firstjob FROM HRData.History[0] AS firstjob
+SELECT History[0] AS firstjob FROM HRData

-SELECT firstjob[2] FROM HRData.History[0] AS firstjob
+SELECT History[0][2] AS firstjob FROM HRData

The third example's result also changes, because the AS alias names the output field:

-     'firstjob[2]': 2006
+     'firstjob': 2006

Sources

Claim	Source
The documented queries are invalid	Ticket, from @yuvraj Kanwar
Nested access goes in the projection with the alias, and the keyspace in FROM	The Slack thread linked from the ticket, supplied by @tim Fletcher: "Your query should be: SELECT reviews[0] AS x FROM hotel;"

The ticket carries a screenshot and a Slack link rather than the corrected text; the pattern above came from that thread.

Beyond the literal example

Two things go slightly past SELECT reviews[0] AS x FROM hotel, so flagging them:

1. SELECT Status.FullTime FROM HRData applies the same correction to dot access rather than array indexing. Same error class, same fix shape, but it is a dot-notation case and the quoted example is an array one.
2. History[0][2] chains two subscripts to keep the example's original meaning, element 2 of the first job. The quoted example indexes once.

Both read as correct {sqlpp} to me, but neither is literally what the thread showed. Worth a glance from whoever has the thread.

Noticed, not changed

Data Projection above has SELECT Name, History, {'FullTime': true} AS 'Status', which single-quotes the alias. That is a different error from the one this ticket reports, so it is left alone.

Other branches

release/8.5 and release/7.6 both carry the same page and the same queries. This PR covers release/8.0 only.

Verification

PASS[docs-server @ DOC-13905 vs baseline release/8.0]: no new build diagnostics.

The build renders the page but does not execute the queries.

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