专业术语
PGA:Program Global Area (PGA) is a memory region that contains data and control information for a server process. PGA
DML: data manipulation language, SELECT、UPDATE、INSERT、DELETE
DDL: data definition language, CREATE、ALTER、DROP…
DCL: Data Control Language, grant,deny,revoke…
PL/SQL: Procedural Language/SQL,which can have process control, such as if, else, loop Record data type in PL/SQL is a group of related data items stored in fields, eahc with its own name and datatype