I have made an application in Pb 6.5 with MySQL and I have a problem when I made a "Select" using 4 tables.
"Select * from t1,t2,t3,t4 where t1.col_1 = t2.col_1 and t2.col_2 = t3.col_2 and t3.col_1 = t4.col_1"
Sometimes works and sometimes don´t. Some told me that could be...
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