我们用跟 SQL GROUP BY 一样的例子。这里的不同处是我们加上了栏位别名以及表格别名: SELECT A1.store_name Store, SUM(A1.Sales) "Total Sales" FROM Store_Information A1 GROUP BY A1.store_name 结果: Store Total Sales Los Angeles $1800 San Diego $250 Boston $700 在结果中,资料本身没有不同。
Let's look at an example of how to alias a table name in Oracle/PLSQL. For example: SELECT p.product_id, p.product_name, categories.category_name FROM products p INNER JOIN categories ON p.category_id = categories.category_id ORDER BY p.product_name ASC, categories.category_name ASC; ...
代码语言:sql 复制 SELECT * FROM ( SELECT column1 AS alias_column FROM table_name ) AS subquery_alias WHERE subquery_alias.alias_column = 'some_value'; 以下是使用CTE的示例: 代码语言:sql 复制 WITH cte_alias AS ( SELECT column1 AS alias_column FROM table_name ) SELECT * FROM cte_alias ...
SELECT first_name "First Name", last_name "Family Name" FROM employees;Code language: SQL (Structured Query Language) (sql) In this example, we used the column aliases "First Name" and "Family Name" enclosed in quotation marks. If you remove the quotation marks, Oracle will issue the fol...
oracle使用表的别名(Alias),当在SQL语句中连接多个表时,请使用表的别名并把别名前缀于每个Column上.这样一来,就可以减少解析的时间并减少那些由Column歧义引起的语法错误.(Column歧义指的是由于SQL中不同的表具有相同的Column名,当SQL语句中出现这个Column时,SQL解析器无法
alias [-ptx] [name[= value]...] unalias [-a] [name...] Description The alias and unalias utilities create or remove a pseudonym or shorthand term for a command or series of commands, with different functionality in the C-shell and Korn shell environments. /usr/bin/alias The alias util...
Synonym is an alternative name for alias. For more information, refer to "Aliases in identifiers" in the SQL Reference, Volume 1. Nickname A nickname is an identifier that you use to identify the data source object that you want to access. The object that a nickname identifies is referred ...
把SQL 语句改成: 代码语言:javascript 代码运行次数:0 AI代码解释 selectcount(*)from(select*from ……)astotal; 问题就解决了,虽然只加了一个没有任何作用的别名total,但这个别名是必须的。 2.使用pagehelper分页时,要在sqlMapConfig.xml 中配置数据库为mysql. 我之前的配置是用的oracle,分页语句用的是rowNum....
FOR SEQUENCE sequence-name, 或 alias-name2 标识为其定义了 alias-name 的序列或序列别名。 如果提供了另一个别名 (alias-name2) ,那么它不能与正在定义的新 alias-name (其标准格式) 相同。 sequence-name 不得是系统为标识列生成的序列 (SQLSTATE 428FB)。 注意 关键字 PUBLIC 用于创建公用别名 (也称...
2 ERROR: subquery in FROM must have an alias 3 LINE 1: select * from (select * from t1 limit 5); 4 ^ 5 HINT: For example, FROM (SELECT ...) [AS] foo. 1. 2. 3. 4. 5. 而在Oracle中是可以不加别名的,例如: 1 SQL> select * from (select * from t1); ...