execute immediate的语法

execute immediate的语法如下： 

execute immediate 'sql';

 execute immediate 'sql_select' into var_1, var_2;
 

execute immediate 'sql' using [in|out|in out] bind_var_1, [in|out|in out] bind_var_2;

execute immediate 'sql_select' into var_1, var_2 using [in|out|in out] bind_var_1, [in|out|in out] bind_var_2;

execute immediate 'sql' returning into var_1;

execute immediate 'sql' bulk collect into indexed_var;