The maximum underscore naming for field and table is two underscore

Naming the initial field table:
i_ = index field
e_ = type data string(char,varchar)/entity
d_ = type data date/time
n_ = type data numeric/integer
v_ = type data float/currency/money
f_ = type data boolean

Naming names beginning table:
tr_ = table referensi,  master-master data
tm_ = table master,  transaction data
th_ = table [...]

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