Can a table or a field be specified by codes in functions?
Of course:
=: select(table: $tableIf; field: 'field'; where: 'id' = #num)
tableIf: if(condition: #type = 1; then: 'table_1'; else: 'table_2')
How do I use $$ for branching?
$$ starts executing a line of code, the name of which is determined by another string.
How can this be used for branching? For example, in the type field, there are different select values depending on which we need to take different select:
=: $$type
type: #type
0: select(table: 'table_1'; field: 'field_1'; where: 'id' = #num)
1: @table_2.field_2
2: 0