SELECT retrieves data from a table or view. Serving as an overlaid filter for a database table, SELECT using SQL keywords retrieves required data from data tables. Precautions Using SELECT can join HDFS and ord
Syntax: SELECT [ALL | DISTINCT | DISTINCTROW ] [HIGH_PRIORITY] [STRAIGHT_JOIN] [SQL_SMALL_RESULT] [SQL_BIG_RESULT] [SQL_BUFFER_RESULT] [SQL_CACHE | SQL_NO_CACHE] [SQL_CALC_FOUND_ROWS] select_expr [, select_expr ...] [FROM table_references [PARTITION partition_list] [WHERE where_co...
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; +---+---+---+ ...
sql 複製 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。
syntaxsql 複製 [ 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...
SET odps.sql.allow.fullscan=true; SELECT * from sale_detail; 如果整个项目都需要开启全表扫描,项目空间Owner执行如下命令打开开关: SETPROJECT odps.sql.allow.fullscan=true; 当查询聚簇表(cluster表)时,目前版本只对单表扫描分区数小于等于400时进行分桶裁剪优化。当分桶裁剪优化未生效时,会导致扫描数据增...
mysql> select a as 列1,b as 列 2 from test1; ERROR 1064 (42000): 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 '2 from test1' at line 1 ...
MySQL语法错误1064是指在执行SQL语句时遇到了语法错误,具体错误信息为1064。在这个问题中,SQL语句是"SELECT * FROM System"。 根据MySQL的语法规则,这个语句中的"System"应该是一个表名,但是在MySQL中,"System"是一个保留字,不能直接作为表名使用。为了解决这个问题,可以使用反引号(`)将保留字括起来,或者...
代码语言:sql AI代码解释 SELECT * FROM order > 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 正确的 代码语言:sql AI代码解释 mysql> SELECT * FROM `ORDER`; +---+---+...
The addition has the same meaning for this data source as when specified statically. In source_syntax, static attributes or constants of a class cannot be accessed from outside in cases where the class has a static constructor and the constructor was not yet executed. ...