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change the date format ,column is of text data type

原文 2018-09-24 17:47:44 8 1 postgresql/ datetime/ date-formatting

i have a table with column app_date (data type is text).i want to convert it to different format.Below are the examples

app_date 

Sep-17   
Jan-18  
Jun-16

i want to convert it as

 new_app_date

 Sep2017
 Jan2018
 Jun2016

1 answers

Use replace():

update my_table
set app_date = replace(app_date, '-', '20')
returning app_date

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