The following example is the difference between these joins, please refer to: -join When using left join, right join, full (outer) join, it is possible to return NULL value, while (inner) join, cross join will not return NUll value. ,ISNULL(ILETR.,0) AS ĪND ILETR.=BAR.ĪND ILEMS.=BAR. Here's my sql query code WITH Barcodes AS but im getting NULL result once i add a FULL JOIN "ILEmsales".first FULL JOIN "ILEtransfer" no NULL result.WHERE table_schema = 'public' AND table_type = 'BASE TABLE' AND table_name != 'new_table' AND table_name != 'spatial_ref_sys'ĮXECUTE 'CREATE TEMP TABLE temp_table AS SELECT * FROM ' || quote_ident(r.table_name) || ' NATURAL FULL OUTER JOIN new_table' ĮXECUTE 'CREATE TABLE new_table AS SELECT * FROM temp_table' ĮXECUTE 'DROP TABLE ' || quote_ident(r. This can be done for X number of tables in the following way, as described in this answer: CREATE TABLE new_table () įOR r IN SELECT table_name FROM information_schema.tables I needed the FULL OUTER part for the rows to actually be inserted into the new table. I got it to work as intended by writing SELECT * INTO new_table will give you a result, without any prior knowledge of column names. I've tried using UNION and FULL OUTER JOIN, but it did not work. These specifics are not necessarily important for the solution, but I included it in the question because someone might know something that I've missed that could have solved this already in the import. The specifics of my problem is that I'm working with the S-57 format and importing to the database using ogr2ogr. A solution for any number of tables with unknown names is better. I want all rows from all the original tables inserted into the new table.Ī solution where all the tables to be merged are known is good.The new table should have all the columns, but no duplicate columns.There's too many of these for me to name. These tables have some columns that are not in common.These tables have some columns in common.I want to merge several tables into one. I also tried FULL OUTER JOIN, but it doesn't work because some columns are defined in multiple tables. I can't use UNION because the tables don't have the same columns. I asked a different but related question on the GIS stackexchange. This shouldn't really affect the solution unless I've missed some ogr2ogr option that automatically imports everything into a single table. 000 file, but I intend to append the import with data from several files. The tables that I want to merge into one were generated by ogr2ogr (GDAL 2.1.0) from data in the S-57 format. However, I'm adding the specifics in case you have knowledge that may help based on that. If you can give me an answer based on this then I may be able to proceed to solving the specifics of my problem on my own. However, a solution that doesn't assume that would be superior. You may assume that I know the names of all the tables that I want to merge. If necessary I can specify the columns that are common to all tables, but I can't specify the columns which are common only to a few tables. What I do know is that some columns are the same for every table while other columns are individual for each table. Assume that I can't know the names of all the columns (there are A LOT of them). I have several tables that I want to merge into a single table. It should be an automated process though, which can be performed by sending SQL commands to the database with psql.exe. What I want to do is meant to be done once and then stay that way. Processing speed matters not for my needs.
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