A PL/SQL block has the following structure: [DECLARE declaration_statements ] BEGIN executable_statements [EXCEPTION exception_handling_statements ] END; / []中是可选的.
/* * chap 02 * ------------------------------------------------- */ create or replace function wordcount(str in varchar2) return pls_integer as words pls_integer :; ); inside_a_word boolean; begin .. loop )) or i > len then if inside_a_word then word
For PL/SQL 1)Create Directory Where BLOB resides. create or replace directory temp as '/oradata2'; -- if the directory name you created not qoted, then you can only use upper case to refer it. -- create or replace directory temp as 'xxxx', the temp d
SQL is not very flexible and it cannot be made to react differently to differing sutuations easily. In SQL queries we normally tell database what we want but not tell it how to do it. SQL : give commands, commands complete with ; PL/SQL : follow the
