SQL INSERT INTO SELECT The INSERT INTO SELECT statement copies data from one table and inserts it into another table. SQL CASE Above are the basic syntaxes of SQL language, some of them may differ in different SQLs.
The SQL SELECT DISTINCT StatementIn a table, a column may contain many duplicate values; and sometimes you only want to list the different (distinct) values.The DISTINCT keyword can be used to return only distinct (different) values.SQL SELECT DISTINCT SyntaxSELECT DISTINCT column_name,column_...
mysql>helpunionSyntax:SELECT...UNION[ALL|DISTINCT]SELECT... [UNION[ALL|DISTINCT]SELECT...] 第一个select语句的column_name会被当做最后查询结果的列名,接下来的每个select语句所一一对应的列应该和第一个语句的列的数据类型最好保持一致 默认情况下union语句会把最终结果中的重复行去掉,这和增加distinct这个关键...
-- select the unique ages from the Customers tableSELECTDISTINCTageFROMCustomers; Run Code 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...
The SELECT DISTINCT statement is used to return only distinct (different) values去掉重复值 Select distinct syntax: select distinct column 1, column 2, from table name; 例:Select all the different values from the Country column in the Customers table. ...
一.SELECT查看帮助信息 1>.查看SELECT命令的帮助信息 mysql>?SELECTName:'SELECT'Description: Syntax:SELECT[ALL | DISTINCT | DISTINCTROW][HIGH_PRIORITY][STRAIGHT_JOIN][SQL_SMALL_RESULT][SQL_BIG_RESULT][SQL_BUFFER_RESULT]SQL_NO_CACHE[SQL_CALC_FOUND_ROWS]select_expr[, select_expr ...][FROM table...
syntaxsql 复制 SELECT [ ALL | DISTINCT ] [ TOP ( expression ) [ PERCENT ] [ WITH TIES ] ] <select_list> <select_list> ::= { * | { table_name | view_name | table_alias }.* | { [ { table_name | view_name | table_alias }. ] { column_name | $IDENTITY | $ROWGUID }...
1、SELECT语句: 用于从表中选取数据。语法如下: SELECT 列名称 FROM 表名称 2、SELECT DISTINCT语句: 用于从表中选取数据,返回唯一不同的值。语法如下: SELECT DISTINCT 列名称 FROM 表名称 3、WHERE语句: 用于规定选择的标准。语法如下: SELECT 列名称 FROM 表名称 WHERE 列 运算符 值 ...
The syntax of the statement is simple: SELECT DISTINCT column FROM table_name WHERE [condition]; Here, the WHERE condition is optional. The statement applies both to a single column and multiple columns. The syntax of this statement applied to multiple columns is as follows: ...