复制代码 使用CASE表达式:CASE表达式可以根据条件返回不同的值。可以将CASE表达式与子查询结合使用来达到IFNULL的效果。例如: SELECT CASE WHEN (SELECT column_name FROM table_name WHERE condition) IS NULL THEN default_value ELSE (SELECT column_name FROM table_name WHERE condition) END AS result FROM dual...
[,default]) 如果search1 = expression 则返回 result1 如果search2 = expression 则返回 result2 ---CASE 示例: SELECT LAST_NAME,JOB_ID,SALARY, CASE JOB_ID WHEN 'IT_PROG' THEN 1.10*SALARY WHEN 'ST_CLERK' THEN 1.15*SALARY WHEN 'SA_REP' THEN 1.20*SALARY ELSE SALARY END "REVISED SALARY" F...
解决:使用 sql 中的 case 来解决。...SELECT a.id as orderId, case a.platform when 0 then b.name when 1 then c.name end as name,...case a.platform when 0 then b.title when 1 then null end as title FROM order AS a LEFT JOIN ...
select name,type,value from v$parameter; 查看参数可以设置的值和默认值 select * from v$parameter_valid_values; select * from v$parameter_valid_values where name like '%recyclebin%'; VALUE :表示参数可以设置的值 ISDEFAULT :参数的默认值 Oracle参数 1.2. oracle pfile/spfile区别 pfile 默认的名称为...
默认情况下,用户使用的都是Default: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 select username,profilefromDBA_USERS 好,咱们说一说PASSWORD_VERIFY_FUNCTION字段是什么意思,该字段的值应该为oracle中某函数对象的名字,当创建、更改用户口令时会调用到该函数对口令进行校验,默认情况下这里的值是null,也即不...
(SELECT tablespace_name, sum(bytes) bytes, SUM(case autoextensible when 'NO' then BYTES when 'YES' then MAXBYTES else null end) maxbytes FROM dba_data_files GROUP BY tablespace_name) a, (SELECT tablespace_name, SUM(bytes) bytes, MAX(bytes) largest_free FROM dba_free_space GROUP BY ...
(select 1 from check_orders_for_test m where m.orderno = h.orderno) and rownum <= '||IN_rowLimit; execute immediate sqlStr; commit; Return; EXCEPTION WHEN OTHERS THEN OUT_returnCode := 'SP_GET_CHECK_ORDERS_FOR_TEST' || SQLerrm; dbms_output.put_line(OUT_returnCode); ROLLBACK; ...
Oracle与SQLServerSQL判断处理null值方法 sqlserver1.替换null:isnull(arg,value)如:select isnull(price,0.0) from orders2.与null比较: is notnull,isnull如:select * from orders where price isnull ... oracle sql Oracle 转载 mob60475706bec5
If there are multiple instances (as in a cluster), then new business terms must be added to each instance individually. To add a business term to User Messaging Preferences: Click Add. Enter a descriptive name for the business term. Select a data type (string, number, or date). Click ...
LOOP display 'Employee number? '; read emp_number; IF emp_number = 0 THEN exit loop; EXEC ORACLE OPTION (HOLD_CURSOR=YES); EXEC SQL SELECT ENAME, SAL INTO :emp_name, :salary FROM EMP WHERE EMPNO = :emp_number; display 'Salary for ', emp_name, ' is ', salary; ENDLOOP; ... ...