It's the mysql client library C API that introduces the limitation:
Executes the SQL statement pointed to by the null-terminated string stmt_str. Normally, the string must consist of a single SQL statement without a terminating semicolon (“;”) or \g.
Special steps must be taken to allow execution of multiple statements, and seems to be new in version 5.0.
The Postgresql C API doesn't follow that model, but makes another interesting remark:
Note however that the returned PGresult structure describes only the result of the last command executed from the string
which makes it less useful to run multiple statements in a single API call.
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