Hello, let me ask you a question.
I am re-pasting the index of a table.
What does this
Sex is character(1).
Please give me guidance.postgresql
In PostgreSQL, two colons
: represent the cast of the type.In other words, we cast
'm' to the
bpchar type is the internal name of
text are different type
Without this type cast, the type
'm' will be interpreted as
unknown, so it's probably an explicit type cast.
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