union - Combining mysql tables -

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how combine table x , y:

table x (columna, columnb, columnc) table y (columna, columnb, columnd)

to (columna, columnb, columnc, columnd) ?

i expecting see null values...

to more specific, here contents of tables:

tablex:   b   c 1 | 0 | 0 2 | 0 | 0  tabley:   b   d 3 | 0 | 0 4 | 0 | 0  result:   b   c   d 1 | 0 | 0 | null 2 | 0 | 0 | null 3 | 0 | null | 0 4 | 0 | null | 0

i don't think expecting join, concatenate:

select columna, columnb, columnc, null columnd tablex union select columna, columnb, null columnc, columnd tabley

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