You're asking for every single row of the table, so nothing's going to
avoid a full scan. The index wouldn't help.
On 30/09/15 15:18, Sumit Nigam wrote:
Hi,
I have a table as:
CREATE TABLE EXP (ID BIGINT NOT NULL PRIMARY KEY, TEXT VARCHAR);
If I explain the select:
EXPLAIN SELECT ID FROM EXP;
Then it shows CLIENT 1-CHUNK PARALLEL 1-WAY FULL SCAN OVER EXP ....
I assume it still uses rowkey. Or is it should have shown using rowkey
in explain plan?
Also, is it a good idea to declare VARCHAR(n) vs plain VARCHAR? Does
it save some space?
Thanks,
Sumit
