请问如下语句OPEN RC1 FOR
‘ Select
a.name
From
prob a,
slam d
WHERE a.id = d.id (+)
AND ' || ' NVL(a.start, a.orig_time) BETWEEN :var1 AND :var2
'
请问这里的 || 怎么理解
‘ Select
a.name
From
prob a,
slam d
WHERE a.id = d.id (+)
AND ' || ' NVL(a.start, a.orig_time) BETWEEN :var1 AND :var2
'
请问这里的 || 怎么理解
prob a,
slam d
WHERE a.id = d.id (+) AND NVL(a.start, a.orig_time) BETWEEN :var1 AND :var2
WHERE a.id = d.id(+) AND NVL(a.start, a.orig_time) BETWEEN :var1 AND :var2 using a1,a2--a1,a2 为过程中传入的参数值