在PL/SQL 编程中嵌套 IF-ELSE 语句,这意味着您可以使用一个 IF 要么ELSE IF 在另一个内部声明 IF 要么ELSE IF 声明。 句法 IF( boolean_expression 1)THEN -- executes when the boolean expression 1 is true IF(boolean_expression 2) THEN -- executes when the boolean expression 2 is true sequence...
1、 打开熟悉的查看工具:PL/SQL Developer。 在PL/SQL Developer中写好一段SQL代码后,按F5,PL/SQL Developer会自动打开执行计划窗口,显示该SQL的执行计划。 2、 查看总COST,获得资源耗费的总体印象 一般而言,执行计划第一行所对应的COST(即成本耗费)值,反应了运行这段SQL的总体估计成本,单看这个总成本没有实际...
nested_table_variable.EXTEND;Code language:SQL (Structured Query Language)(sql) Then, use the assignment operator (:=) to add an element to the nested table: nested_table_variable := element;Code language:SQL (Structured Query Language)(sql) If you want to add multiple elements, you use th...
建立这个表的脚本是:rdbms\admin)ultxplan.sql。 SQL> connect sys/sys@colm2 as sysdba; SQL> @rdbms\admin\utlxplan.sql; SQL> create public synonym plan_table for plan_table;--建立同义词 SQL> grant all on plan_table to public;--授权所有用户 要在数据库中建立一个角色plustrace,用sys用户运行...
已解决: nested exception is java.sql.SQLDataException: ORA-01476: divisor is equal to zero 问题 oracle 除零异常,且sql重复语句过多 思路 使用decode 或者 NULLIF 解决除零异常问题 原SQL case when冗余 可以用 case when in 简化 解决 在这个修改后的SQL语句中,NULLIF函数用于处理zzje、zxjje和jxjje计算...
put_line(i || ' is prime'); END IF; i := i + 1; exit WHEN i = 50; END LOOP; END; / When the above code is executed at the SQL prompt, it produces the following result −2 is prime 3 is prime 5 is prime 7 is prime 11 is prime 13 is prime 17 is prime 19 is ...
If the schema name of the nested table type refers to an existing schema, CREATEIN privilege on the schema DBADM authority Syntax >>-CREATE--+---+--TYPE--assocarray--+-IS-+---> '-OR REPLACE-' '-AS-' >--TABLE OF--datatype--->...
the values of the array and the size of the array are not instantiated. This sample uses the Extend method of the Nested Table to add members within a FOR loop. An IF statement is used to assign the values according to the value of the integer i as the FOR loop is executed. A 2nd...
SQL> SQL> BEGIN 2 INSERT INTO color_models 3 VALUES ('RGB', color_tab_t ('RED','GREEN','BLUE')); 4 END; 5 / PL/SQL procedure successfully completed SQL> select * from color_models; MODEL_TYPE COLORS --- --- RGB <Objec SQL> select * from color_model_colors_tab; select * f...
OraclePLSQL之嵌套表（NestedTable）OraclePLSQL 之嵌套表（NestedTable ）Test Code:Connected to Oracle Database 11g Enterprise Edition Release color_model_colors_tab 6 / Table created SQL> SQL> BEGIN 2 INSERT INTO color_models 3 VALUES ('RGB', color_tab_t ('RED','GREEN','BLUE'));4 ...