- #POSTGRESQL INSERT INTO FROM SELECT HOW TO#
- #POSTGRESQL INSERT INTO FROM SELECT FULL#
- #POSTGRESQL INSERT INTO FROM SELECT SERIES#
Don’t forget that you can select fixed values if no column from the query has the info ( INSERT INTO X(p,c,age) SELECT personname, cityname, 23 FROM. The basic syntax of INSERT INTO SELECT is as follows: INSERT INTO table(column1, column2. The number of columns inserted to must match the number of columns selected. However, I trust that the general pattern shown first will suffice for your learning write a SELECT that shows the data you want to insert, then simply write INSERT INTO table(columns) above it. If you just want to mix every person with every city you can do: INSERT INTO employee(personname,cityname)īut be warned, two people and two cities will cause 4 rows to be inserted, and so on (20 people and 40 cities, 800 rows. If the data is largely printable ASCII, then try > setting 'byteaoutput' to 'escape': > 2. Note: The existing records in the target table are unaffected. Provide eg a cityname in Person (because it seems more likely that one city has many person) then you can do INSERT INTO employee(personname,cityname)īut even then, the tables are related between themselves and don’t need the third table so it’s perhaps something of an academic exercise only, not something you’d do in the real world The INSERT INTO SELECT statement requires that the data types in source and target tables match.
In your case there isn’t really anything to join on because your one-column tables have no column in common.
The general pattern for turning a select that has two base tables giving info, into an insert is: INSERT INTO table(column,list,here) There doesn’t appear to be any obvious relationship between city and person which will make your life hard
#POSTGRESQL INSERT INTO FROM SELECT HOW TO#
The textbook I have for class doesn't dive into sub-queries like this and I can't find any examples similar enough to mine such that I can understand how to adapt them for this use case. Notice in the last block of code, where I'm doing an INSERT into the employee table, I don't know how to string together multiple SELECT sub-queries to get both the existing records from the person and city table such that I can create a new employee entry with attributes as such: Introduction to PostgreSQL INSERT statement The PostgreSQL INSERT statement allows you to insert a new row into a table. create employee entry referencing existing records Create a employee table w/ForeignKey referenceĮname VARCHAR(255) REFERENCES person(pname) NOT NULL,Įcity VARCHAR(255) REFERENCES city(cname) NOT NULL, Create a city table + insert single row INSERT INTO products (productno, name, price) VALUES (1, Cheese, 9.99), (2, Bread, 1.99), (3, Milk, 2. I am always interested in new challenges so if you need consulting help, reach me at all posts by Rajendra GuptaI am learning SQL (postgres) and am trying to insert a record into a table that references records from two other tables, as foreign keys.īelow is the syntax I am using for creating the tables and records: - Create a person table + insert single row
#POSTGRESQL INSERT INTO FROM SELECT SERIES#
I am the creator of one of the biggest free online collections of articles on a single topic, with his 50-part series on SQL Server Always On Availability Groups.īased on my contribution to the SQL Server community, I have been recognized as the prestigious Best Author of the Year continuously in 2019, 2020, and 2021 (2nd Rank) at SQLShack and the MSSQLTIPS champions award in 2020. I published more than 650 technical articles on MSSQLTips, SQLShack, Quest, CodingSight, and SeveralNines.
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#POSTGRESQL INSERT INTO FROM SELECT FULL#
Hi! I am Rajendra Gupta, Database Specialist and Architect, helping organizations implement Microsoft SQL Server, Azure, Couchbase, AWS solutions fast and efficiently, fix related issues, and Performance Tuning with over 14 years of experience. INSERT INTO products (productno, name, price) SELECT productno, name, price FROM newproducts WHERE releasedate 'today' This provides the full power of the SQL query mechanism ( Chapter 7 ) for computing the rows to be inserted.
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