Problem One QC process need to obtain tables and their row counts in a database in Netezza. We use the below SQL query to do so: )) TABLE_NAME, ) ) ) * RELREFS) + ( RELTUPLES ) END AS BIGINT) NUM_ROWS FROM _T_CLASS ,_T_OBJECT ; Now oneday an issue oc
if the hive version not support drop table tablename purge. your drop table command will move data to .Trash in hdfs. dfs .Trash; drop table tablename; dfs .Trash/Current; #batch drop tables you want in hive. hive --database databaseName -e "show tab
转载自:http://www.w3school.com.cn/sql/sql_alter.asp ALTER TABLE 语句 ALTER TABLE 语句用于在已有的表中添加.修改或删除列. SQL ALTER TABLE 语法 如需在表中添加列,请使用下列语法: ALTER TABLE table_name ADD column_name datatype 要删除表中的列,请使用下列语法: ALTER TABLE table_name DROP COLUMN column_name 注释:某
drop后的表被放在回收站(user_recyclebin)里,而不是直接删除掉.这样,回收站里的表信息就可以被恢复,或彻底清除. 1.通过查询回收站user_recyclebin获取被删除的表信息,然后使用语句flashback table <user_recyclebin.object_name or user_recyclebin.original_name> to before drop [rename to <new_table_name>]; 将回收站里的表恢复为原名称
*************************** --判断数据库是否存在 IF EXISTS (SELECT * FROM MASTER..sysdatabases WHERE NAME = '库名') PRINT 'exists ' else PRINT 'not exists' *************************** -- 判断要创建的表名是否存在 IF EXISTS (Select * From sysObjects Where Name ='表名' And Type