In SQL, how to format values so I have column1value.column2value -


i new sql , have problems formatting. in column1, have categories living, food, transportation , in each category, have subcategories. example, food.lunch, food, grocery.

now want have new column called detailed expenses in want display category.subcategory

for example, food.lunch

how can achieve this? help?

you need structure table (not oop approach)

categories ----------------------- id  name         parent 1   food         0 2   lunch        1 ... 3   category     0 4   subcategory  3

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