Loop nesting issues. It's not hard, I'm confused.
There are 4 categories of items:
Category 1: (I, II)
Category 2: (a,b,c,d)
Category 3: (a,b,c,d)
Category 4: (A, B, C, ding)
Want to achieve the following effect, how to cycle? How to build a table? A SQL statement seems to be a certainty, right?
One AA, one AB, one AC, one ad,
A A, a B, a-C, a-ding,
One ba, one BB, one BC, one BD,
A B, a B, a B-C, a B-ding,
One CA, one CB, one cc, one CD,
A C, a C, a C, a C ding,
One DA, one db, one DC, one DD,
A d A, a D B, a D C, a D-Ding,
A A, a B, a-C, a-ding,
A B, a B, a B-C, a B-ding,
A C, a C, a C, a C ding,
A d A, a D B, a D C, a D-Ding,
Two AA, two AB, two AC, two ad,
Bis A, two a B, two A, two a ding,
Two ba, two bb, two BC, two BD,
b, two B, two B, two B,
Two CAs, two CB, two cc, two CDs,
Two c A, two C B, two C, two C-butyl,
Two da, two db, two DC, two DD,
Two d, two D, B, D, B, D Ding,
Two A, two a B, two a C, two a ding,
b, two B, two B, two B,
Two c A, two C B, b c c, ii C Ding,
Two d, two D, B, D, B, D Ding,
------Solution--------------------
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