Average of 2 columns for an insert

Question

Hello I have two tables and want to get the average of every value within a row( Not AVG- function) e.g. . I want to write an insert table "Messdaten_vorbereitung" and extract the rows from table "STAGE_DM_MESSDATEN". So, i want to get
(air_temp_port_der +air_temp_stb_der)/2 for column AIR_TEMP_AVG in table "Messdaten_vorbereitung"     
create table STAGE_DM_MESSDATEN
SYSTEM_DATE_DER                DATE,
SYSTEM_TIME_DER                VARCHAR(8),
AIR_TEMP_PORT                     BINARY_DOUBLE,
AIR_TEMP_STB                     BINARY_DOUBLE,
TRUE_WD_PORT_DER                BINARY_DOUBLE,
TRUE_WD_STB_DER                BINARY_DOUBLE,
TRUE_WS_PORT                     BINARY_DOUBLE,
TRUE_WS_STB                     BINARY_DOUBLE,
HUMIDITY_PORT                     BINARY_DOUBLE,
HUMIDITY_STB                     BINARY_DOUBLE,
WATER_TEMP_PORT                BINARY_DOUBLE,
WATER_TEMP_STB                     BINARY_DOUBLE);
create table Messdaten_vorbereitung
SYSTEM_DATE_DER                DATE,
SYSTEM_TIME_DER                VARCHAR(8),
AIR_TEMP_AVG                     BINARY_DOUBLE,
TRUE_WD_AVG                     BINARY_DOUBLE,
TRUE_WS_AVG                         BINARY_DOUBLE,
HUMIDITY_AVG                    BINARY_DOUBLE,
WATER_TEMP_AVG                    BINARY_DOUBLE);
How can I do it?
Thanks a lot

Answer 1

I'm a historian by training and chary about straying into the realm of high maths but wouldn't this work?
INSERT INTO Messdaten_vorbereitung
SELECT  system_date_der ,
     system_time_der,
     (air_temp_port+air_temp_stb)/2,
     (true_wd_port_der+true_wd_stb_der)/2,
     (true_wd_port+true_wd_stb)/2,
     (true_ws_port+true_ws_stb)/2,
     (humidity_port+humidity_stb)/2,
     (water_temp_port+water_temp_stb)/2
FROM  stage_dm_messdaten
/Cheers, APC