Frequently Asked Questions (FAQ) - SQL SELECT with DISTINCT on multiple columns 1.What is the purpose of using DISTINCT on multiple columns in SQL? DISTINCT on multiple columns eliminates rows where all selected fields are identical, ensuring unique combinations of the specified columns in the resu...
Here, the SQL command selects only the unique values of age from theCustomerstable. Syntax of SQL SELECT DISTINCT SELECTDISTINCTcolumn1, column2 ...FROMtable; Here, column1, column2, ...are the table columns tableis table name from where we retrieve the distinct columns Example: SQL SELECT...
SELECT语句的基本语法如下: SELECT column1, column2, ...SELECT DISTINCT 关键字 SQL的SELECT DISTINCT语句用于选择表中的不同(唯一)值。...SELECT DISTINCT的基本语法如下: SELECT DISTINCT column1, column2, ...以下是一些示例: 从"Customers"表中选择不同的国家: SELECT DISTINCT Country FROM Customers;...
A column often contains many duplicate values, and sometimes the information needed from a single column has to be distinct. Using the SELECT DISTINCT statement inSQL, we can filter out distinct values from a column. Syntax SELECT DISTINCT column1, column2, columnN<br> FROM tablename;<br> ...
To retrieve unique data based on multiple columns, you need to specify the column list in theSELECTclause as follows: SELECTDISTINCTcolumn_1, column_2, column_3FROMtable_name;Code language:SQL (Structured Query Language)(sql) In this syntax, theDISTINCToperator uses the combination of values in...
2.常用语句 SELECT...WHERE <s> [NOT]BETWEEN<f1>AND<F2>.SELECT...WHERE COL2LIKE'_ABC%'.SELECT...WHERE <s> [NOT]IN(<f1>,..,<fn>)...SELECT...WHERE <s> [NOT]IN<seltab>... 查询存在selection table,Range变量里的数据。
Examples of SQL SELECT DISTINCT Multiple Columns Different examples are mentioned below: We are using distinct_multiple tables to define examples. Code: Select * from distinct_multiple; Output: Example #1 In the below example, we retrieve the count of unique records from multiple columns by using...
SELECT [DISTINCT] expr_list [FROM [db.]table | (subquery) | table_function] [FINAL] [SAMPLE sample_coeff] [ARRAY JOIN ...] [GLOBAL] ANY|ALL INNER|LEFT JOIN (subquery)|table USING columns_list [PREWHERE expr] [WHERE expr] [GROUP BY expr_list] [WITH TOTALS] [HAVING expr] [ORDER ...
MySQL基础SQL编程学习1 相同点:均在WHERE中使用作为筛选条件之一、均是等于的含义; 不同点:IN可以规定多个值,等于规定一个值; 基础示例: -- in 与 = 的转换 select * from Websites where...ON table1.column_name=table2.column_name; 基础实例: -- 这次将user_kc作为左表,而...
Note:With UNION, only distinct values are selected. SQL Statement 1 UNION SQL Statement 2 Employees_Norway: Employees_USA: Using the UNION Command Example List all different employee names in Norway and USA: SELECT E_Name FROM Employees_Norway UNION SELECT E_Name FROM Employees_USA ...