oracleI基础入门(6)--sql语句-Alias (别名) ALIAS 接下来,我们讨论 alias (别名) 在 SQL 上的用处。最常用到的别名有两种:栏位别名及表格别名。 简单地来说,栏位别名的目的是为了让 SQL 产生的结果易读。 在之前的例子中,每当我们有营业额总合时,栏位名都是 SUM(sales)。虽然在这个情况下没有什么问题,...
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TABLE ALIASES are used to shorten your SQL to make it easier to read or when you are performing aself join(ie: listing the same table more than once in the FROM clause(列出相同的表不止一次在那个from从句)). Syntax The syntax to ALIAS A COLUMN in Oracle/PLSQL is: column_name AS alias...
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1 Oracle invalid identifier when using table alias 0 Issue while querying a alias column in oracle 1 sql invalid identifier, using alias 0 Query throws "ORA-32033 : unsupported column alias" 5 ORA-00998: must name this expression with a column alias 0 ORA-00933: SQL command not pro...
对模式的 CREATEIN 特权 (如果别名的模式名称引用现有模式) 或对SY溅射的 CREATEIN 特权 (如果正在创建公用别名) (如果正在创建公用别名) DBADM 权限 通过其别名使用所引用对象所需的特权与直接使用该对象所需的特权相同。 要替换现有别名,语句的授权标识必须是现有别名的所有者 (SQLSTATE 42501)。
oracle.javatools.db.sql.SQLQueryClauseException oracle.javatools.db.sql.AliasInUseException All Implemented Interfaces: java.io.Serializable public class AliasInUseException extends SQLQueryClauseException SQLQueryException thrown when an attempt is made to add an object whose alias is already in use...
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); ...
Public aliases can be used only in SQL statements and with the LOAD utility. The definition of the newly created table alias is stored in SYSCAT.TABLES. The definition of the newly created module alias is stored in SYSCAT.MODULES. The definition of the newly created sequence alias is stored ...
帮你改了一下，加上了一部分表名，重点是加上了的mid1,mid2,mid3,mid4,你自己在语句中添加一下试试。select * from(select a.*, rownum rnfrom(select * from personnel_info peiwhere pei.position_num in(select poi.position_num from position_info poi where poi.belong_dep in (select...