Sybase = *向mysql右外连接

Question

I have the the following Sybase sql statement that contains a right outer join (i think) using the syntax =* . I am trying to replicate this in mysql and failing horribly. Can anyone suggest how i state the right outer join in the from section.

SELECT database1.inst.regionAbb,
       database1.inst.regionalCode,
       database1.inst.instCode,
       database1.inst.name,
       database1.inst.yCode,
       database1.blac.customerCode,
       database1.inst.transportCode,
       database1.inst.Agreement,
       database1.addr.telephone,
       database1.addr.fax,
       database1.addr.email,
       database1.addr.id contactaddr,
       database1.inst.nameAbb,
       database1.inst.messageType,
       database1.inst.closedFrom,
       database1.inst.closedTo,
       database1.inst.costScheme1,
       database1.inst.costScheme2,
       database1.inst.costScheme3,
       database1.inst.costScheme4,
       database1.inst.costScheme5,
       now() updated

FROM database1.Table1 inst,
     database1.Table2 addr,
     database1.Table3 blac

WHERE ((database1.addr.instCode = database1.inst.instCode) **
       AND ((database1.blac.instCode =* database1.inst.instCode)**
       AND (database1.blac.preferred = "Y")))
       AND ((database1.addr.id = database1.inst.Address
       AND database1.inst.lendingTable2 != 0)
       OR (database1.addr.id = database1.inst.mainTable2
       AND database1.inst.lendingTable2 = 0))

Answer 1

I'm not familiar with Sybase, but I think this is what you're going for:

SELECT * FROM 
FROM database1.Table1 inst,
INNER JOIN database1.Table2 addr ON addr.instCode = inst.instCode
LEFT JOIN database1.Table3 blac ON blac.instCode = inst.instCode
WHERE blac.preferred = "Y"
  OR (blac.preferred IS NULL AND
       ((addr.id = inst.Address    AND inst.lendingTable2 != 0)
     OR (addr.id = inst.mainTable2 AND inst.lendingTable2 = 0)))

This assumes it only does the final check if there is no blac record - if you actually want to do that check if there is no blac record OR blac.preferred != 'Y' then you can remove the blac.preferred IS NULL AND as well as the extra pair of parenthesis.

Answer 2

SELECT * FROM（（在inst.instCode = blac.instCode和blac.preferred =“ Y”上的（database1.Table1 inst左联接database1.Table3 blac）加入（addr.instCode = inst.instCode和（（（addr .id = inst.lendingTable2和inst.lendingTable2 <> 0）或（（（addr.id = inst.mainTable2）和（inst.lendingTable2 = 0））））））;