In this exercise, you use nested IF statements. This script converts the value of a temperature from one system to another. If the temperature is supplied in Fahrenheit, it is converted to Celsius, and vice versa. Create the following PL/SQL script: -- ch04_4a.sql, version 1.0 SET SERV...
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...
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用户运行脚本plustrce.sql来创建这个角色,这个脚本在目录(sql...
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 ...
1.如何在PL/SQL中创建和使用Nested table 1DECLARE2/**创建一个 nested table **/3TYPE type_nstb_noind_varistableofvarchar2(300);4/** 创建一个索引类型为varchar的nested table,也可以指定其它类型(BINARY_INTEGER、PLS_INTEGER、String、Long、RAW、LONG RAW、ROWID,CHAR,CHARACTER) **/5Type type_nstb...
It is possible to create a nested table type located in the database: CREATE[ORREPLACE]TYPEnested_table_typeISTABLEOFelement_datatype [NOTNULL];Code language:SQL (Structured Query Language)(sql) If you want to drop a type, use the followingDROP TYPEstatement: ...
1foreach rowin(select*fromT1wherename='David') loop2for(select*fromT2whereT2.id=outer.id) loop3Ifmatchthenpass the rowontothenextstep4Ifno matchthendiscard the row5endloop6endloop 具体来说, 如果上述 sql 语句执行循环嵌套连接的话, 那么实际的执行过程应该如下所示: ...
Create a SELECT statement to view the data in the Employees table using the keyword column_value and THE with a subquery. The information appears to be the data entered by the previously executed INSERT statement. Retrieving Data from a PL/SQL Nested Table Type ...
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...
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 END;5 / PL/SQL procedure ...