1 PL/SQL中有两种类型的FOR循环：数字型FOR循环和游标型FOR循环。数值型FOR循环式传统的大家熟悉的“计数”循环，这种FOR循环的迭代次数在循环开始的时候就知道了。如果在FOR循环的范围处没有设置循环索引的递进方向从低到高或者从高到低（reverse将范围条件置反）。语法如下：FOR loopIndex IN [REVERSE] lowes...
SQL statements that are supported within PL/SQL contexts can be used to modify data or to specify the manner in which statements are to be executed. Table 1 lists these statements. The behavior of these statements when executed in PL/SQL contexts is equivalent to the behavior of the ...
executable statements --可执行部分 [exception handlers] --异常区 end; 输出: select 'abc' fromdual; dbms_output.put_line('abc'); --打印输出(必带begin) begin dbms_output.put_line('abc'); end 赋值:( := ) --变量声明赋值,并打印 ...
PL/SQL has three categories of control statements: conditional selection statements, loop statements and sequential control statements. PL/SQL categories of control statements are: Conditional selection statements, which run different statements for different data values. The conditional selection statements...
PL/pgSQL basic statements Introduction In this section, we have described all the statement types that are explicitly understood by PL/pgSQL. Anything not recognized as one of these statement types is presumed to be an SQL command and is sent to the main database engine to execute....
statements;END LOOP; 实例如下: CREATETABLEtemp_table(num_colNUMBER);DECLAREV_counterNUMBER:=10;BEGININSERTINTOtemp_table(num_col)VALUES(v_counter ); FOR v_counter IN 20 .. 25 LOOPINSERTINTOtemp_table (num_col )VALUES( v_counter );ENDLOOP;INSERTINTOtemp_table(num_col)VALUES(v_counter )...
--statements [EXCEPTION] END; 过程 PROCEDURE name IS BEGIN --statements [EXCEPTION] END; 函数 FUNCTION name RETURN datatype IS BEGIN --statements RETURN value; [EXCEPTION] END; 1、 创建存储过程 1)语法 CREATE [OR REPLACE] PROCEDURE procedure_name ...
Table 1. SQL statements that can be executed by the data server within PL/SQL contexts CommandDescription DELETEDeletes rows from a table INSERTInserts rows into a table MERGEUpdates a target (a table or view) using data from a source (result of a table reference) ...
Comparing P&L Statements It is important to compare income statements from different accounting periods. The reason behind this is that any changes in revenues, operating costs, research and development (R&D) spending, and net earnings over time are more meaningful than the numbers themselves. For...