--查询主键列SELECTCOLUMN_NAMEFROMUSER_CONS_COLUMNSWHERECONSTRAINT_NAME=(SELECTCONSTRAINT_NAMEFROMUSER_CONSTRAINTSWHERETABLE_NAME='TABLE_NAME'ANDCONSTRAINT_TYPE='P');--查询唯一键列SELECTCOLUMN_NAMEFROMUSER_CONS_COLUMNSWHERECONSTRAINT_NAME=(SELECTCONSTRAINT_NAMEFROMUSER_CONSTRAINTSWHERETABLE_NAME='TABLE_NAME...
alter table s_stuadd(snamevarchar2(20),sage number); 代码语言:javascript 代码运行次数:0 运行 AI代码解释 alter table husband add sage number constraint husband_sage_checkcheck(sage<=100); 2.删除列: 语法:alter table tableName drop column column_name; 例如: 代码语言:javascript 代码运行次数:0 ...
manager.SqlManager.execute(SqlManager.java:748) at org.apache.sqoop.manager.SqlManager.execute(SqlManager.java:771) at org.apache.sqoop.manager.SqlManager.getColumnInfoForRawQuery(SqlManager.java:270) at org.apache.sqoop.manager.SqlManager.getColumnTypesForRawQuery(SqlManager.java:241) at org....
alter table test add name varchar2(10) default 'test' not null ; 1. alter table s_stu add (sname varchar2(20),sage number); 1. alter table husband add sage number constraint husband_sage_check check(sage<=100); 1. 2.删除列: 语法:alter table tableName drop column column_name; 例如...
emp.sql中就有DLL语句了 三、通过9i的DBMS_METADATA包得到DLL语句 基本上用到的语法如下: a. 获取单个的建表和建索引的语法 set heading off; set echo off; Set pages 999; set long 90000; spool DEPT.sql select dbms_metadata.get_ddl('TABLE','DEPT','SCOTT') from dual; ...
共享SQL区SQL详细信息(SQL文本是CLOB,不同用户执行相同SQL多次记录):v$sqlarea 共享SQL区SQL的文本信息(仅记录文本且拆分成多行):v$sqltext 库缓存性能的统计数据:v$librarycache 联机的回滚段的名字:v$rollstat 后台进程信息:v$bgprocess 会话信息:v$session ...
Support low code + workflow (dynamic class building, dynamic table building, non-entity multi-library compatible with CRUD, JSON TO SQL, custom XML, etc.) Support ValueObject, discriminator, repository, UnitOfWork, DbContext, AOP Documentation ...
SQL(oracle)常用命令 这部分包含那些PostgreSQL 支持的 SQL 命令的信息.这里的 "SQL" 就是该语言通常的含义; 每条命令的与标准有关的兼容性的信息可以在相关的参考页中找到. Table of Contents ABORT--退出当前事务 ALTER GROUP--向组中增加用户或从组中删除用户...
是否从SQL Server的视图中删除单列中的重复项? 您可以使用ROW_NUMBER()来标识每个组的第一行。然后,过滤掉其他行就很容易了。例如: select *from ( SELECT PS.LSiteID, GEO.geographyColumn, row_number() over(partition by PS.LSiteID order by PS.LSiteID) as rn FROM dbo.Project_SiteID_Lookup AS...
If a table includes a BFILE column, the data for the column is stored in the file system. The replication administrative user account must be granted access to the directory in which the data is stored using the following syntax: GRANT READ ON DIRECTORY <directory_name> ...