oracle query table

One. Query article 1. Query Oracle Table space usage Select b.file_id file ID, B.tablespace_name table Space, B.file_name Physical file name, The total number of bytes b.bytes, (B.bytes-sum (NVL (a.bytes,0))) has been used, Sum (NVL (a.bytes,0))

Management of 1.Oracle Tables Naming conventions for table and column names: Must start with a letter; Length cannot exceed 30 characters; Cannot use Oracle's reserved words; Use only the following characters: A-Z, A-Z, 0-9,

Explain Oracle query operations (add, delete, modify, query, pseudo table, advanced query) and oracle Advanced Query SQL query operation: add, delete, modify, and queryI,SQL Operator Arithmetic Operator + -*/ Comparison operator =! = <> = ......

The table size has two meanings. One is the number of physical spaces allocated to a table, regardless of whether the space is used or not. You can query the number of bytes as follows: Select segment_name, bytesFrom user_segmentsWhere

Oracle CBO RBO Detailed url:http://blog.163.com/love-love-l/blog/static/21078304201010175035270/ Http://blog.csdn.net/cnham/archive/2010/04/13/5482318.aspx First part What is Table analysis. Simply put, it is the information that collects tables

Sort out the key points of Data Query Optimization in Oracle databases, and query oracle Data The most basic task of a database is to store and manage data. The only database feature that an end user can see is its performance: the speed at which

Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most

Table size that has two meanings. One is the amount of physical space allocated to a table, regardless of whether space is used or not. You can get the number of bytes in this query:Select Segment_name, bytesFrom User_segmentswhere Segment_type = '

Oracle BASICS (5): Multi-Table query and oracle basic table Query I. Multi-Table query (1) simple multi-Table query 1. Multi-Table query mechanism 1) SQL: SELECT * FROM emp; -- 14 records SELECT * FROM dept; -- four records SELECT * FROM emp, dept; -

Reprinted from http://blog.csdn.net/cuker919/article/details/8514253Select Segment_name, bytes as sizeFrom User_segmentswhere Segment_type = ' TABLE ' and segment_name in (' view_jlzdh_mp_dl_day_01 ', ' view_jlzdh_mp_dl_day_02 ', ' View_jlzdh_mp_ Dl_