In this IF-THEN-ELSE statement example, we've created a function called IncomeLevel. It has one parameter calledname_inand it returns a varchar2. The function will return the income level based on the employee's name. Advertisement
You have encountered different types of conditional controls: the IF-THEN statement, the IF-THEN-ELSE statement, and the ELSIF statement. These types of conditional controls can be nested inside one another. For example, an IF statement can be nested inside an ELSIF, and vice versa. Consider ...
图1:trigger的触发顺序 上图1非常重要,对于trigger的触发顺序的解释一目了然,尤其是下半副图,update数据的时候,对于statement trigger,不管是before还是after,都只会执行一次,而row trigger,却会在每次的udpate的前后执行一次。 1、before、after触发器 创建statement trigger和row trigger的语法直接看下面代码: 1 2 ...
sql statement: alter system set db_unique_name = ''TESTDGPHY'' comment= ''' scope=spfile sql statement: alter system set log_archive_dest_1 = ''LOCATION=/arch valid_for=(ALL_LOGFILES,ALL_ROLES) db_unique_name=TESTDGPHY'' comment= ''' scope=spfile sql statement: alter system set lo...
Example:又用户输入员工号修改员工工资如成功则打印输出成功标志。 为了尽量不改变原表,创建新表emp_new和原表数据相同: CREATE TABLE emp_new AS SELECT * FROM emp; BEGIN UPDATE emp_new SET sal = sal+500 WHERE empno=&empno; IF SQL%FOUND THEN DBMS_OUTPUT.PUT_LINE('成功修改'); COMMIT; ELSE DBM...
The SQL SELECT statement includes other appropriate clauses based on your entries in the FROM clause (table name), WHERE clause, and Other clauses fields in the SQL Clauses window. For example, you can specify values to complete the following tasks: Select the columns Name, Add...
There’s noifkeyword in SQL. If you want to doif-else-thenlogic inselect,whereor anywhere else in a statement, you need acaseexpression. This is a series ofwhenclauses that thedatabaseruns in order: For example, if you want to map exam correct percentages to grade letters according to...
oracle jdbc example 示例 packagewcg.test.jdbc.oracle; importjava.sql.Connection; importjava.sql.DriverManager; importjava.sql.ResultSet; importjava.sql.SQLException; importjava.sql.Statement; publicclassTestConnOracle { /** * @param args */...
This tutorial provides an introduction to the Structured Query Language (SQL), learn how to create tables with primary keys, columns, constraints, indexes, and foreign keys. Tutorial SQL Macros - Creating parameterised views This tutorial explains how to create a parameterized view using SQL Macros...
IF value LIKE pattern THEN 8 DBMS_OUTPUT.PUT_LINE ('TRUE'); 9 ELSE 10 DBMS_OUTPUT.PUT_LINE ('FALSE'); 11 END IF; 12 END; 13 BEGIN 14 compare('Jason', 'J%s_n'); 15 compare('Jason', 'J%S_N'); 16 END; 17 / TRUE FALSE PL/SQL procedure successfully completed. SQL> ...