![]() Syntax: CREATE TABLE newtablename AS TABLE existingtable To copy only table structure without data, WITH NO DATA clause can be used with CREATE TABLE AS statement. Use the following syntax to copy the table completely including table structure and data. pgdump -Fc -f output.dump -t tablename databasename (dump 'tablename' from database 'databasename' into file 'output. To copy a table with partial data from an existing table, you use the following statement: CREATE TABLE newtable AS SELECT FROM existingtable WHERE condition Code language: SQL (Structured Query Language) (sql) The condition in the WHERE clause of the query defines which rows of the existing table will be copied to the new table. PostgreSQL supports CREATE TABLE AS to copy table structure with or without data. ![]() class Information (models.Model): infoid models.AutoField (primarykey True) infoname models.CharField ( maxlength 50) and the following information model in db file called old. create table schema2.thetable (like schema1.thetable including all) Then insert the data from the source to the destination: insert into schema2. pgdump allows the dumping of only select tables. I'd like to copy the contents of one column in a table of on db file to another. Copy the data from the original server with pgbasebackup. Scott Bailey's suggestion in the comments is obviously the right way to do this, wish I'd thought of it myself! Assuming all the original table's PK fields will be present in the destination table, there's no need for a temporary table - just use the complex WHERE conditions to insert into the destination, then DELETE from the original table by joining to this table. Django: copy data from one database to another. These joins will be fast since table PKs are indexed. This will loop through all tables in the old schema and recreate them with data (no constraints, indexes, etc) in the new schema.- Set the search path to the target schema SET searchpath newSchema - Loop over the table names and recreate the tables DO DECLARE tablename text BEGIN FOR tablename IN SELECT t.tablename FROM informationschema.tables t WHERE t.tableschema 'public. First INSERT to this table to "define" the set of rows to operate on, and then join with this table for the table-copying INSERT and DELETE. Hmm, even less intrusive would be to create a new temporary table whose only purpose is to contain the PKs of records that you want to include. Then your INSERT and DELETE commands can simply check this column for their WHERE clauses.ĭon't forget to delete the column from both source and destination tables afterwards! ![]() ADD COLUMN on the original table to add a boolean field, and run an UPDATE on the table to set that field to true WHERE. If the condition is so complicated that you don't want to execute it twice (which BTW sounds unlikely to me, but anyway), one possibility would be to ALTER TABLE.
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