PostgreSQL – INSERT Query
The PostgreSQL INSERT INTO statement allows one to insert new rows into a table. One can insert a single row at a time or several rows as a result of a query.
Basic syntax of INSERT INTO statement is as follows −
INSERT INTO TABLE_NAME (column1, column2, column3,...columnN) VALUES (value1, value2, value3,...valueN);
- Here, column1, column2,…columnN are the names of the columns in the table into which you want to insert data.
- The target column names can be listed in any order. The values supplied by the VALUES clause or query are associated with the explicit or implicit column list left-to-right.
You may not need to specify the column(s) name in the SQL query if you are adding values for all the columns of the table. However, make sure the order of the values is in the same order as the columns in the table. The SQL INSERT INTO syntax would be as follows −
INSERT INTO TABLE_NAME VALUES (value1,value2,value3,...valueN);
The following table summarizes the output messages and their meaning −
|S. No.||Output Message & Description|
|1||INSERT oid 1
Message returned if only one row was inserted. oid is the numeric OID of the inserted row.
|2||INSERT 0 #
Message returned if more than one rows were inserted. # is the number of rows inserted.
Let us create COMPANY table in testdb as follows −
CREATE TABLE COMPANY( ID INT PRIMARY KEY NOT NULL, NAME TEXT NOT NULL, AGE INT NOT NULL, ADDRESS CHAR(50), SALARY REAL, JOIN_DATE DATE );
The following example inserts a row into the COMPANY table −
INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY,JOIN_DATE) VALUES (1, 'Paul', 32, 'California', 20000.00,'2001-07-13');
The following example is to insert a row; here salary column is omitted and therefore it will have the default value −
INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,JOIN_DATE) VALUES (2, 'Allen', 25, 'Texas', '2007-12-13');
The following example uses the DEFAULT clause for the JOIN_DATE column rather than specifying a value −
INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY,JOIN_DATE) VALUES (3, 'Teddy', 23, 'Norway', 20000.00, DEFAULT );
The following example inserts multiple rows using the multirow VALUES syntax −
INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY,JOIN_DATE) VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00, '2007-12-13' ), (5, 'David', 27, 'Texas', 85000.00, '2007-12-13');
All the above statements would create the following records in COMPANY table. The next chapter will teach you how to display all these records from a table.
ID NAME AGE ADDRESS SALARY JOIN_DATE ---- ---------- ----- ---------- ------- -------- 1 Paul 32 California 20000.0 2001-07-13 2 Allen 25 Texas 2007-12-13 3 Teddy 23 Norway 20000.0 4 Mark 25 Rich-Mond 65000.0 2007-12-13 5 David 27 Texas 85000.0 2007-12-13
Python Example for Beginners
Two Machine Learning Fields
There are two sides to machine learning:
- Practical Machine Learning:This is about querying databases, cleaning data, writing scripts to transform data and gluing algorithm and libraries together and writing custom code to squeeze reliable answers from data to satisfy difficult and ill defined questions. It’s the mess of reality.
- Theoretical Machine Learning: This is about math and abstraction and idealized scenarios and limits and beauty and informing what is possible. It is a whole lot neater and cleaner and removed from the mess of reality.
Data Science Resources: Data Science Recipes and Applied Machine Learning Recipes
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