A concise tutorial of SQL statements for Linux---DISTINCT

The SELECT command allows us to read all the data from one or more fields in a table. This will take all the data out, regardless of whether the data values are duplicated or not. In data processing, we often encounter situations where we need to find out the different data values in the table. In other words, we need to know what the different values are in this table/field, and the number of times each value appears is not important. How is this going to be achieved? In SQL, this is easy to do. We just need to add a DISTINCT to the SELECT . The syntax for DISTINCT is as follows: Select DISTINCT "Field name" From "table name"; For example, to find out all the different store names in the following table,store_information, store_information Form Store_name Sales Txn_date Los Angeles 1500 05-jan-1999 San Diego 250 07-jan-1999 Los Angeles 300 08-jan-1999 Boston 700 08-jan-1999 We'll break in, SELECT DISTINCT store_name from Store_information; Results: Store_name Los Angeles San Diego Boston

Test results under Linux:

Reprint please specify: Xiao Liu

A concise tutorial of SQL statements for Linux---DISTINCT