This Oracle tutorial explains how to use the IF-THEN-ELSE statement in Oracle with syntax and examples. In Oracle, the IF-THEN-ELSE statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE.
用于判断前后者SELECTMOD(SIGNS,2)INTOCALCULATEDFROMDUAL;DBMS_OUTPUT.PUT_LINE('0为前者,1位后者:'||CALCULATED);--条件是两个一组,等于0时为第一个字符,否则为第二个IFCALCULATED=0THEN--判断是否为最大值,最大值时为第一个条件,无需加ANDIFSIGNS=SI_MAXTHENCONDITIONS:=CONDITIONS||F_ALI||L_ID...
IF CONDITION THEN STATEMENT 1; ... STATEMENT N; END IF; 二、 IF-THEN-ELSE语句 IF CONDITION THEN STATEMENT 1; ELSE STATEMENT 2; END IF; 三、 ELSLF语句 IF CONDITION 1 THEN STATEMENT 1; ELSIF CONDITION 2 THEN STATEMENT 2; ELSIF CONDITION 3 THEN STATEMENT 3; ... ELSE STATEMENT N; --...
SELECT语句就像叠加在数据库表上的过滤器,即选择查询用于定位数据库特定的列和行。下面是SELECT语句的基础语法。 SELECT[ALL|DISTINCT SELECT_LISTFROM{table_name|view_name} [WHEREsearch_condition][GROUP BYgroup_by_expression][HAVINGsearch_condition][ORDER BYorder_by_expression [ASC|DESC]] 用中括号[]括起...
在IF子句Oracle中执行select/insert语句是一种在Oracle数据库中使用IF条件语句来执行select和insert操作的方法。IF子句是PL/SQL语言的一部分,用于在程序中根据条件执行不同的操作。 在IF子句Oracle中执行select语句时,可以根据条件选择性地检索数据。语法如下: 代码语言:sql 复制 IF condition THEN SELECT column1, colu...
I need to write a CASE statement to first breakdown each row using a comma delimiter, then loop through each value to see if the codes are part of list a exclusively, list b exclusively, a mix of both, or neither. To put this into practice, we'd look at the first item, 01. It ...
A case expression in SQL is an equivalent to IF statement in other languages: CASE WHEN condition THEN value1 [ ELSE value2 ] END I guess that you are looking for something like this: SELECT distinct A, B, C, D, E, SUM(F+G+H) AS "FGH", SUM(I -(FGH)) AS "I", CASE WHEN...
实验二数据查询一、实验目的1、掌握SELECT的语法结构;2、掌握单表查询;3、掌握连接查询;4、掌握子查询;5、掌握集合查询;二、实验内容1、在数据库ORCL中创建Student、SC、Course三个表,表结构如下所示:学生表Student(Sno,Sname,Ssex,Sage,Sdept)结构如下:Sno(学号)varchar(12)Sname(姓名)varchar(8)Sage(年龄)...
一、第三方软件（如plsql）1、登录到指定数据库。2、点击左上角像纸片的按钮，选择sql窗口。3、编写select where的语句后，点击执行按钮，如图：4、则数据内容会显示在下方：二、用oracle自带的sqlplus执行 1、点击开始菜单，在搜索框输入“cmd”并回车，进入命令提示符。2、输入“sqlplus”，然后回车。
Once the control goes to an exception block, it doesn't go back to the begin or declare section of the pl/sql block. Following the same, if there is an error in your first select statement, the exception block will be executed and the respective handler would be u...