Thank you for all the prompt replies and explanations about databases. I am a little new in this, so maybe I made some conclusions not quite right.
I was hoping that you can help me with issues like importing sql dumps from other sources (mssql and mysql), because I wanna migrate into postgre, and also how to import DDL from other tables into postgre and afterwards import the CSV files. Having them created manually is quite long.
On Sun, May 20, 2018, 10:15 Peter J. Holzer <hjp-pgsql@hjp.at> wrote:
On 2018-05-19 17:05:42 +0200, Milorad Krstevski wrote: > So first I have to create all (for example 50 columns and define them in data > type) and then import? That is not the case with any other db.
I am quite certain that it is also the case for Oracle and MySQL.
I suspect that it is true for all SQL databases, since SQL distinguishes between data definition (DDL) and data manipulation (DML) statements. Loading data into a table is data manipulation, and you don't want that to change your data definition as a side effect.
Which database can automatically create columns while loading a CSV file into a table?
(It is of course possible to write a program which guesses the types of the columns from the contents of the CSV file and then issues an appropriate CREATE TABLE or ALTER TABLE statement. I wrote one 20 years ago. But that's an application program, not part of the database.)
hp
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