In the spirit of give a man a fish... 
SELECT        AM.AM_A, AM.AM_M

FROM        AM
LEFT JOIN    AR ON AR.AR_A=AM.AM_A
LEFT JOIN    SA ON SA.SA_A=AM.AM_A
LEFT JOIN    MR ON MR.MR_M=AM.AM_M
LEFT JOIN    SM ON SM.SM_M=AM.AM_M
#LEFT JOIN    SR ON SR.SR_M=AM.AM_M

WHERE        AR.AR_A IS NULL
AND        SA.SA_A IS NULL
AND        MR.MR_M IS NULL
AND        SM.SM_M IS NULL
#AND        SR.SR_M IS NULL

[download]
Something close to this may be closer to the result you want. I didn't see you use a WHERE clause vs the SR table, so I left it commented out.

In reply to Re: (OT) perl, memory and mysql by Anonymous Monk
in thread (OT) perl, memory and mysql by Anonymous Monk

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