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Search for user and user table fields in Oracle

Source: Internet
Author: User
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1. Search for user tables

  1. SelectTable_name, num_rowsFromAll_tablesWhereOWNER ='Tiger' ANDTABLE_NAMELike '% Master'
  2. Order ByNum_rowsDesc
2. Search user table fields
  1. Select*FromUser_tab_columns
  2. WhereDATA_TYPE ='Char' AndDATA_LENGTH = 119
  3.  AndTable_name =Upper('Imblmaster')
3. Search for repeated fields. Remove the count function to retrieve records.
  1. Select Count(*)FromSys_data
  2. WhereTrxrefIn(SelectTrxrefFromSys_dataGroup ByTrxrefHaving Count(Trxref)> 1)
  3. -- Or
  4. Select Sum(N)From(SelectTrxref,Count(Trxref)AsNFromSys_datasGroup ByTrxrefHaving Count(Trxref)> 1)
4. Search for records that are not repeated
  1. Select Count(Trxref)From(SelectTrxref,Count(Trxref)AsNFromSys_dataGroup ByTrxrefHaving Count(Trxref)> 1)
5. Search for redundant duplicate records
  1. Select Count(*)FromSys_data
  2. WhereTrxrefIn(SelectTrxrefFromSys_datasGroup ByTrxrefHaving Count(Trxref)> 1)
  3. AndRowidNot In(Select Min(Rowid)FromSys_dataGroup ByTrxrefHaving Count(Trxref)> 1)
6. Delete redundant duplicate records
  1. Delete FromSys_data
  2. WhereTrxrefIn(SelectTrxrefFromSys_dataGroup ByTrxrefHaving Count(Trxref)> 1)
  3. AndRowidNot In(Select Min(Rowid)FromSys_data

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