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The PostgreSQL SELECT statement is used to select data from the database.
The results are stored in a result table called a result set.
The syntax format of the SELECT statement is as follows:
SELECT column1, column2,...columnN FROM table_name;
column1, column2,...columnN is the field name in the table.
table_name is the table name.
If we want to read all the data in the table, we can use the following SQL statement:
SELECT * FROM table_name;
in the previous chapter INSERT INTO statement In the table, we have inserted some data into the table company using * number can read all the data in the table:
w3codeboxdb=# SELECT * FROM company; 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
We can also read the specified fields ID and NAME:
w3codeboxdb=# SELECT ID, NAME FROM company; id | name ----+------- 1 | Paul 2 | Allen 3 | Teddy 4 | Mark 5 | David (5 rows)