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PLSQL ????????????????????????PLSQL????1. getBookCount ??```plsqlcreate function getBookCount return number asbegin  declare book_count number;  begin    select count(*) into book_count from t_book;    return book_count;  end;end getBookCount;set serveroutput on;begin  dbms_output.put_line('t_book ?????: ' || getBookCount() || ' ?');end;

2. getTableCount ??

create function getTableCount(table_name varchar2) return number asbegin  recore_count number;  query_sql varchar2(300);  begin    query_sql:='select count(*) from ' || table_name;    execute immediate query_sql into recore_count;    return recore_count;  end;end getTableCount;

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begin  dbms_output.put_line('???????: ' || getTableCount('??') || ' ?');end;

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