Decode函数的语法结构如下:

相关操作代码如下：

decode (expression, search_1, result_1)
decode (expression, search_1, result_1, search_2, result_2)
decode (expression, search_1, result_1, search_2, result_2, ...., search_n, result_n)

decode (expression, search_1, result_1, default)
decode (expression, search_1, result_1, search_2, result_2, default)
decode (expression, search_1, result_1, search_2, result_2, ...., search_n, result_n, default)

decode函数比较表达式和搜索字，如果匹配，返回结果；如果不匹配，返回default值；如果未定义default值，则返回空值。
以下是一个简单测试，用于说明Decode函数的用法:

相关操作代码如下：

SQL> create table t as select username,default_tablespace,lock_date from dba_users;

Table created.

SQL> select * from t;

USERNAME                       DEFAULT_TABLESPACE             LOCK_DATE
------------------------------ ------------------------------ ---------
SYS                            SYSTEM
SYSTEM                         SYSTEM
OUTLN                          SYSTEM
CSMIG                          SYSTEM
SCOTT                          SYSTEM
EYGLE                          USERS
DBSNMP                         SYSTEM
WMSYS                          SYSTEM                         20-OCT-04

8 rows selected.

SQL> select username,decode(lock_date,null,"unlocked","locked") status from t;

USERNAME                       STATUS
------------------------------ --------
SYS                            unlocked
SYSTEM                         unlocked
OUTLN                          unlocked
CSMIG                          unlocked
SCOTT                          unlocked
EYGLE                          unlocked
DBSNMP                         unlocked
WMSYS                          locked

8 rows selected.

SQL> select username,decode(lock_date,null,"unlocked") status from t;

USERNAME                       STATUS
------------------------------ --------
SYS                            unlocked
SYSTEM                         unlocked
OUTLN                          unlocked
CSMIG                          unlocked
SCOTT                          unlocked
EYGLE                          unlocked
DBSNMP                         unlocked
WMSYS

8 rows selected.

oracle单库彻底删除干净的执行步骤

oracle单库彻底删除干净:关闭数据库、关监听、清除残余文件、删除用户和组，详细操作如下，感兴趣的兄弟姐妹可以参考下哈，一、关闭数据库[[email protected]]$sqlplus / as sysdba

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