ORACLE 常用函数学习笔记

1.字符串截取方法

--5
SELECT INSTR('8.30~9.00', '~') FROM dual;
--8.30
SELECT SUBSTR ('8.30~9.00', 0, INSTR ('8.30~9.00', '~',1,1)-1) AS time FROM dual;
--18.30
SELECT SUBSTR ('18.30~19.00', 0, INSTR ('18.30~19.00', '~',1,1)-1) AS appointstime FROM dual;

2.字符串转数字

to_number(SUBSTR (appointstime, 0, INSTR (appointstime, '~',1,1)-1)) 

3.日志输出

dbms_output.put_line( :new.a);

dbms_output.put_line( '输出日志');