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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2011-10-01 14:01:46 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2011-10-01 14:01:46 -0400 |
| commit | 5ec6b7f1b87f0fa006b8e08a11cd4e99bcb67358 (patch) | |
| tree | 3f178e9a5ffd1683278a94614e2b11779116a983 /doc/src/sgml/ref | |
| parent | 878b74e094a70e660e5ed365a2c4e1b41460515d (diff) | |
Improve generated column names for cases involving sub-SELECTs.
We'll now use "exists" for EXISTS(SELECT ...), "array" for ARRAY(SELECT
...), or the sub-select's own result column name for a simple expression
sub-select. Previously, you usually got "?column?" in such cases.
Marti Raudsepp, reviewed by Kyotaro Horiugchi
Diffstat (limited to 'doc/src/sgml/ref')
| -rw-r--r-- | doc/src/sgml/ref/select.sgml | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/doc/src/sgml/ref/select.sgml b/doc/src/sgml/ref/select.sgml index 7fb52833e8a..636435fe1d8 100644 --- a/doc/src/sgml/ref/select.sgml +++ b/doc/src/sgml/ref/select.sgml @@ -758,8 +758,9 @@ UNBOUNDED FOLLOWING If you do not specify a column name, a name is chosen automatically by <productname>PostgreSQL</productname>. If the column's expression is a simple column reference then the chosen name is the same as that - column's name; in more complex cases a generated name looking like - <literal>?column<replaceable>N</>?</literal> is usually chosen. + column's name. In more complex cases a function or type name may be + used, or the system may fall back on a generated name such as + <literal>?column?</literal>. </para> <para> |