Nested loops. It seems that it is not difficult. I am confused. There are four categories: Category 1: (1, 2) Category 2: (A, B, C, D) Category 3: (a, B, c, d) Category 4: (, b, C, Ding) how can we achieve the following results? How to create a table? An SQL statement seems to be wrong, right? A Aa, A AB, an Ac, an Ad, A, a B, A C, A D, loop nesting problem. It seems that it is not difficult. I am confused.
There are four categories:
Category 1: (1, 2)
Category 2: (A, B, C, D)
Category 3: (a, B, c, d)
Category 4: (a, B, c, and D)
How can we achieve the following results? How to create a table? An SQL statement seems to be wrong, right?
Aa, AB, Ac, Ad,
A, a B, A C, A D,
A Ba, a Bb, a Bc, a Bd,
One B a, one B, one B c, one B D,
A Ca, a Cb, a Cc, a Cd,
A c a, a c B, A C, A C D,
One Da, one Db, one Dc, one Dd,
D a, d B, D c, D,
A, a B, a C, a D,
One B A, one B, one B C, one B D,
A c A, A c B, A c, A c D,
D A, d B, d c, d,
2AA, 2AB, 2AC, 2AD,
2 A, 2 a B, 2 A C, 2 A Ding,
2ba, 2BB, 2BC, 2BD,
2B A, 2B B, 2B C, 2B D,
Two Ca, two Cb, two Cc, two Cd,
2c A, 2C B, 2C C, 2C Ding,
Two Da, two Db, two Dc, two Dd,
2d A, 2d B, 2d C, 2D d,
2 a, 2 a B, 2 a C, 2 a Ding,
2B A, 2B B, 2B C, 2B D,
2c A, 2C B, 2C c, 2C Ding,
2d A, 2d B, 2d C, 2D d,
------ Solution --------------------
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