dropping observations if 2 strings are empty

[Timme Ariens]

Hi

I want to drop all observations which don't have date in 2 string variables:

for example
if A = empty and B=empty --> drop
if A or B != empty --> dont drop

I tried drop if A == "" and B== "" but it states a invalid and operation

i cant include a dataex because the characters in one of the variables are too long.

Thanks in advance!

[Ali Atia]

The AND logical operator in Stata is &:

A=="" & B==""

See -help operator-.

You can also use:

missing(B) & missing(A)

[Timme Ariens]

Ah i guess i am used to the python syntax. Thanks Ali