CLUSTER equivalent

[Kevin Murphy <murphy@xxxxxxxxxxxxxxx>]

Are the two following options equivalent?

OPTION A (ordered insert):

CREATE TABLE table1 (cluster_col TEXT, col2 INTEGER);
CREATE INDEX idx1 ON table1(cluster_col);
INSERT INTO table1 (cluster_col, col2) SELECT cluster_col, col2 FROM 
table1 ORDER BY cluster_col;

OPTION B (unordered insert followed by CLUSTER):

CREATE TABLE table1 (cluster_col TEXT, col2 INTEGER);
CREATE INDEX idx1 ON table1(cluster_col);
INSERT INTO table1 (cluster_col, col2) SELECT cluster_col, col2 FROM table1;
CLUSTER idx1 ON table1;

Thanks,
Kevin Murphy

P.S.  On another topic, did I gather correctly from a recent thread that 
it would be more efficient to define the above table (if it were really 
only two columns) as:

create table clustered_tagged_genes (integer pmid, text mention);

i.e., with the integer field before the text field?


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