query to list all tables in oracle database

understood as simple data formatting. For example, case when a. isnullable = 1 then '√ 'else'' appears in this SQL statement to convert the database from to '√ 'and ''; 2. Left join: This join method can be used to describe a join relation in the query results. 3. isnull function: isnull(Check_Expression, Replacement_value),The function is to replace null with the specified replacement value. For examp

/* Query all tables in the specified database */Select count (*) from information_schema.tables where table_schema = 'mdm '/* database name */Select T. table_name, T. table_collation from information_schema.tables t where T. table_schema = 'mdm '/*

MYSQL specifies the number of rows in all tables in the database query bitsCN.com MYSQL specifies the number of rows in all tables in the database. [SQL] SELECT CONCAT ('Union

Scripts | data | database --========================================================================== --Note: This script is used to query the number of record bars for all tables in the current database --and the results are saved in the Tableinfo table and will not be del

When Oracle recovers a table during data recovery, the table already exists, and you need to determine how to operate according to the ignore parameter settings. If ignorey, Oracle does not execute When Oracle recovers a table during data recovery, the table already exists, and you need to determine how to operate according to the ignore parameter settings. If ig

Export the table structures of all user tables in the Oracle database and store them in an Excel table. The storage information is shown in: Export the table structures of all user tables in the

Oracle | sqlserver | names of all tables in access. Field Names * fromuser_tableswheretable_name: SELECT * FROMUSER_TABLES; other users: SELECT * FROMALL_TABLESWHEREOWNERUSER_NAME nbsp; Oracle | SQL server | names of all tables i

When I used imp to import a database backup in dmp format today, I found that an import error occurred and reminded that the object already exists so that I can only remember to delete all tables before importing, if the database has dozens of hundreds of tables, it would be

1, using the sysobjects system table in this table, each object created in the database (for example, constraints, defaults, logs, rules, and stored procedures) has a row, and we filter out all the records in the table that are xtype equals u, which is the table in the database. The example statements are as follows:SELECT * from sysobjects where xtype= ' U 'Note

-- Query Information about all oracle tables, tablespaces, and database connections -- 1. select table_name, num_rows, avg_row_len, num_rows * avg_row_len --, 'delete from' | table_name | ';' from user_tables t order by num_rows * avg_row_len desc; -- 2.

SELECTUser_tab_cols. table_name astable name, Utc.comments astable Chinese name, User_tab_cols. column_id ascolumn ordinal, User_tab_cols. column_name ascolumn name, User_tab_cols. Data_type asdata type, User_tab_cols. Data_length aslength, User_tab_cols. NULLABLE asIs empty, user_col_comments.comments asNotes fromUser_tab_cols Left Joinuser_tab_comments UTC onUser_tab_cols. table_name=Utc.table_nameInner Joinuser_col_comments onUser_col_comments. table_name=User_tab_cols. TABLE_NAME andUser_col

1. Query table name:SELECT table_name from User_all_tables;2. Assemble statistical SQL statements:1 >select ' SELECT ' | | table_name | | ' As TableName, COUNT (*) from ' | | table_name | | ‘ ; ' As Exectutesql from User_all_tables;2> select ' Select ' | | table_name | | ' As TableName, COUNT (*) from ' | | table_name | | ' Union ' as exectutesql from User_all_tables;3. Copy the assembled Exectutesql executionselect * from ( 第二步2> 执行的结果复制到这里 删除最后一个 un

The following articles mainly describe how to export all tables of certain users in Oracle databases. In actual applications, many users may use Oracle, related customers generally want to export all tables of related users. This

dba_tab_comments，all_tab_comments，这两个比user_tab_comments多了ower列。4. Get field Comments:select * from user_col_commentsuser_col_comments：table_name,column_name,comments相应的还有dba_col_comments，all_col_comments，这两个比user_col_comments多了ower列。user_col_comments;表字段注释（列注释）USER_COL_COMMENTS 视图显示已经为表中的列输入的注释。这些注释通过comment命令添加到数据库中。USER_COL_COMMENTS 视图包含3 列：Table_Name 表名或视图名Column_Name 列名Comments 已经为该列输入的注释5, Check table field Comment Case:查看JH表中字段的注释：select table_name,column_name,comments from user_col_commen

, tables and views are not the same way, in Oracle, the adoption of a user-management mechanism, tables and views are linked under a user, the user will become a "schema" Oracle While in MySQL tables and views are directly attached to the

1. Delete All database tablesSelect 'drop view' | view_name | ';' | CHR (13) | CHR (10) from user_views;--------------------------------------------Drop table lo_caseinfo;Drop table lo_harmonizecase;Drop table lo_lawcheck;Drop table lo_legislationitem;Drop table lo_trainbatch;Drop table oa_impress;Drop table oa_sysgroup;The drop statement of all

If you want to query all the tables in the database, you can querySelect * From dba_tables If you want to query the tables of a user in the database, you can also log on to the user an

Label:1.oracle querying the number of tables in the database:Select COUNT (*) from User_tablesThe premise of this operation is that the login is successful2.mysql querying the number of tables in the database:SELECT COUNT (*) TABLES, table_schema from INFORMATION_SCHEMA. TABLES