Postgres Sql：更改表

Question

I am fetching all the records from the Excel sheet and adding columns into the database according to the Excel header row. After fetching I alter the table and adding columns into the newly created table and it works perfectly fine. but when I add one more column into the excel file and running the query again it supposed to add the column which I have created in the excel file but instead, it gives me an error of Column already exists The query which I m running is

"ALTER TABLE " + name + " ADD " + cellValue + " varchar(5000)"

Thanks in advance..

Answer 1

如果您只想创建不存在的列，请像这样编写查询

"ALTER TABLE " + name + " ADD if not exists " + cellValue + " varchar(5000)"