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# sql_substr works as expected
Code
substr("test")
Condition
Error in `check_integer()`:
! argument "start" is missing, with no default
---
Code
substr("test", 0)
Condition
Error in `check_integer()`:
! argument "stop" is missing, with no default
---
Code
substr("test", "x", 1)
Condition
Error in `check_integer()`:
! `start` must be a single number
---
Code
substr("test", 1, "x")
Condition
Error in `check_integer()`:
! `stop` must be a single number
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