select getpik(patronid) fromSelect pf.patronid from patronflags pf, pers p where pf.patronid = p.id_persand pf.flagnumber = '2'
Select pf.patronid from patronflags pf, pers p where pf.patronid = p.id_pers
目前它使用的是yield from{ // some other stuff (no yieldsyield from $generator;如果我用一个简单return替换这个yield from,在这种情况下会有什么变化吗?也许是在行刑的时候?还是性能?yield from会产生一个新的‘外部’迭代器吗?
我知道,在其他情况下,yield from可以更灵活,因为我可以多
SELECT ProductName FROM Product where ProductId = 1012SELECT ColumnName FROM ProductMapping该语句的结果是"ProductName“
SELECT (SELECT PM.ColumName FROM Product where ProductId = 1012) FROM ProductMapping
BILL_DATE,DAILY_RENT,ADVANCE,C_NAME,RENTAL_ID,C_CARD,VIN)(7,'2016-01-12',500,1000,(select rental_id from car_rental.company where rental_id=1),
(selectc_card from car_rental.customer where c_id=11),&