sql - How do I automatically update table columns while importing data in PostgreSQL? -


i have table my_table layout follows (sample rows):

id    start                 end 1     2010-05-29 11:22:00   2010-06-06 13:45:59 2     2010-04-03 01:15:00   2010-07-21 14:30:59 3     2010-05-02 16:12:00   2010-11-01 15:12:59

column id of data type integer while start , end columns in character varying(20). have database my_db in postgresql 9.5 (x64) on windows 7 (x64) based machine. want change data type of start , end columns timestamp without time zone. can achieved postgres command:

alter table my_table alter column start type timestamp without time zone using start::timestamp without time zone

however, update data type of these columns while importing data my_db. wondering in postgresql possible update column data types when data imported (for example, when data imported via postgis shapefile/dbf loader or qgis db manager postgresql detects these data types automatically , changes them desired ones). if yes, can suggest me how automate such process?


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