Selecting multiple columns from multiple tables

Question

I've constructed the flowing SQL for my netezza db:

select t.TRADE_OID, t.TRADE_ID, t.TRADE_VERSION, t.TRADE_SOURCE_SYSTEM, tl.LINK_PARENT_ID, 
tl.LINK_PARENT_VERSION, tc.CHARGE_AMOUNT FROM EQ_MO_TRADE (NOLOCK) t, EQ_MO_TRADE_CHARGE (NOLOCK) tc, EQ_MO_TRADE_LINKAGE (NOLOCK) tl 
WHERE t.Last_update_time >= '2013-01-09 00:00:00' 
AND t.last_update_time < '2013-01-10 00:00:00' 
AND t.TRADE_OID = tl.TRADE_OID
AND t.TRADE_OID = tc.TRADE_OID
AND tc.CHARGE_NAME = 'Commission'

However I'm given the general error:

 [SELECT - 0 row(s), 0.000 secs]  [Error Code: 1100, SQL State: HY000]  ERROR:  'select 

t.TRADE_OID, t.TRADE_ID, t.TRADE_VERSION, t.TRADE_SOURCE_SYSTEM, tl.LINK_PARENT_ID, tl.LINK_PARENT_VERSION, tc.CHARGE_AMOUNT FROM EQ_MO_TRADE (NOLOCK) t, EQ_MO_TRADE_CHARGE (NOLOCK) tc, EQ_MO_TRADE_LINKAGE (NOLOCK) tl 
WHERE t.Last_update_time >= '2013-01-09 00:00:00' 
AND t.last_update_time < '2013-01-10 00:00:00' 
AND t.TRADE_OID = tl.TRADE_OID
AND t.TRADE_OID = tc.TRADE_OID
AND tc.CHARGE_NAME = 'Commission' limit 1000'
error                                                                                                                                                         

^ found "(" (at char 150) expecting `EXCEPT' or `FOR' or `INTERSECT' or `ORDER

Character 150 is between these two:

Trade and (NOLOCK)

My syntax seems correct but DBVisualiser won't run the query.

Answer 1

As far as I can tell from the Netezza Database User's Guide (5.0.x) , Netezza does not support Optimizer hints like WITH (NOLOCK) .

From page 3.36

Note that there is no need for user intervention, commands, or hints

In any event, NOLOCK is widely regarded as dubious practice .

However, Netezza does support INNER JOIN Syntax (p2.17)

I would rewrite the query as follows:

SELECT
    t.TRADE_OID, 
    t.TRADE_ID, 
    t.TRADE_VERSION, 
    t.TRADE_SOURCE_SYSTEM, 
    tl.LINK_PARENT_ID, 
    tl.LINK_PARENT_VERSION, 
    tc.CHARGE_AMOUNT 
FROM 
  EQ_MO_TRADE t 
    INNER JOIN EQ_MO_TRADE_CHARGE tc
            ON (t.TRADE_OID = tc.TRADE_OID)
    INNER JOIN EQ_MO_TRADE_LINKAGE tl 
        ON (t.TRADE_OID = tl.TRADE_OID)
WHERE 
  t.Last_update_time >= '2013-01-09 00:00:00' 
  AND t.last_update_time < '2013-01-10 00:00:00' 
  AND tc.CHARGE_NAME = 'Commission'