参考:http://dev.mysql.com/doc/refman/5.1/zh/sql-syntax.html#select 一、select子句 主要定义需要选取的字段,包括选择selection,投影projection,连接join (一)选择 1、所有字段 mysql> select * from users; 2、指定字段 mysql> select uname,department,email from users where id>2; +---+---+---+ ...
参考:http://dev.mysql.com/doc/refman/5.1/zh/sql-syntax.html#select 一、select子句 主要定义需要选取的字段,包括选择selection,投影projection,连接join (一)选择 1、所有字段 mysql> select * from users; 2、指定字段 mysql> select uname,department,email from users where id>2; +---+---+---+ ...
select id as "编号", `name` as "姓名" from t_stu; #起别名时,as都可以省略 select id as 编号, `name` as 姓名 from t_stu; #如果字段别名中没有空格,那么可以省略"" select id as 编号, `name` as 姓名 from t_stu; #错误,如果字段别名中有空格,那么不能省略"" 5. 数据导入指令 在命令...
在WHERE子句中,您可以指定分区范围,只扫描表的指定部分,避免全表扫描。命令示例如下。 SELECT * FROM sale_detail WHERE sale_date >= '2008' AND sale_date <= '2014'; --等价于如下语句。 SELECT * FROM sale_detail WHERE sale_date BETWEEN '2008' AND '2014'; 返回结果如下。 +---+---+---+...
syntaxsql复制 [WITH<common_table_expression>[ , ...n ] ]SELECT<select_criteria>[ ; ]<select_criteria>::=[TOP(top_expression) ] [ALL|DISTINCT] { * |column_name| expression } [ , ...n ] [FROM{table_source} [ , ...n ] ] [WHERE<search_condition>] [GROUPBY<group_by_clause>]...
USE AdventureWorks2022; GO SELECT AVG(UnitPrice) AS [Average Price] FROM Sales.SalesOrderDetail; column_alias可用在 ORDER BY 子句中。 不過,它不能用在 WHERE、GROUP BY 或 HAVING 子句中。 如果查詢運算式是 DECLARE CURSOR 陳述式的一部分,column_alias 就不能用在 FOR UPDATE 子句中。備註...
Syntax [with<cte>[, ...] ]select[all|distinct]<select_expr>[,<except_expr>][,<replace_expr>] ...from<table_reference>[where<where_condition>] [groupby{<col_list>|rollup(<col_list>)}] [having<having_condition>] [window<window_clause>] ...
[42000][1064] You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ORDER' at line 1 SELECT * FROM `order`; 我们需要保证表中的字段、表名等没有和保留字、数据库系统或常用方法冲突。如果真的相同,在 SQL 语...
Syntax Arguments Remarks Autoexists Show 2 more Retrieves data from a specified cube. Syntax Copy [ WITH <SELECT WITH clause> [ , <SELECT WITH clause>...n ] ] SELECT [ * | ( <SELECT query axis clause> [ , <SELECT query axis clause>,...n ] ) ] FROM <SELECT subcube clause> [...
corresponds to your MySQL server versionforthe right syntax to use near'ORDER'at line1# 正确 mysql>SELECT*FROM`ORDER`; 查询常数(查询同时添加常数字段) SELECT 查询还可以对常数进行查询。对的,就是在 SELECT 查询结果中增加一列固定的常数列。这列的取值是我们指定的,而不是从数据表中动态取出的。