Combined columns and renaming : Columns « Query Select « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Query Select » Columns 




SQL> create table emp(
  2           emp_id                integer         primary key
  3          ,lastname               varchar2(20)    not null
  4          ,firstname              varchar2(15)    not null
  5          ,midinit                varchar2(1)
  6          ,street                 varchar2(30)
  7          ,city                   varchar2(20)
  8          ,state                  varchar2(2)
  9          ,zip                    varchar2(5)
 10          ,shortZipCode                   varchar2(4)
 11          ,area_code              varchar2(3)
 12          ,phone                  varchar2(8)
 13          ,company_name           varchar2(50));

Table created.

SQL>
SQL>
SQL> insert into emp(emp_id,lastname,firstname,midinit,street,city,state,zip,shortZipCode,area_code,phone,company_name)values
  2                      (1,'Jones','Joe','J','Ave','New York','NY','11202','1111','212', '221-4333','Big Company');

row created.

SQL> insert into emp(emp_id,lastname,firstname,midinit,street,city,state,zip,shortZipCode,area_code,phone,company_name)values
  2                      (2,'Smith','Sue','J','Street','New York','NY','11444','1111','212', '436-6773','Little Company');

row created.

SQL> insert into emp(emp_id,lastname,firstname,midinit,street,city,state,zip,shortZipCode,area_code,phone,company_name)values
  2                      (3,'X','Peggy','J','Drive','New York','NY','45502','2222','212', '234-4444','Medium Company');

row created.

SQL> insert into emp(emp_id,lastname,firstname,midinit,street,city,state,zip,shortZipCode,area_code,phone,company_name)values
  2                      (4,'Murdy','Jill', null,'93Eady St','New York','NY','45452','6458','212', '634-7733','Wilton Company');

row created.

SQL> insert into emp(emp_id,lastname,firstname,midinit,street,city,state,zip,shortZipCode,area_code,phone,company_name)values
  2                      (5,'Oper','Carl','L','19 Studio Drive','New York','NY','67672','3234','212', '243-4243','Wesson and Smith Company');

row created.

SQL>
SQL>
SQL> select emp_id,
  2   firstname || ' ' || lastname as "Name",
  3   city, state
  4    from emp
  5   where state = 'RI';

no rows selected

SQL>
SQL> drop table emp;

Table dropped.














2.8.Columns
2.8.1.Selecting All Columns from a Table with asterisk character (*)
2.8.2.Count(*) and column renaming
2.8.3.Expression and column renaming
2.8.4.DISTINCT tableName.*
2.8.5.Combined columns and renaming
2.8.6.Format date value and column renaming
2.8.7.Reference one column more than once
2.8.8.Reference renamed column in order by
2.8.9.Rename case when column
2.8.10.Returning Multiple Columns
2.8.11.Table renaming in from clause
2.8.12.Use table name to reference column name
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