數據抽取Sql語句

時間 2019-12-14

標籤數據抽取 sql 語句欄目 SQL 简体版

原文原文鏈接

最近在開發數據庫元數據抽取的功能，鑑於本身剛剛開始學習元數據查詢，在開發的過程當中遇到了許多問題，針對這些問題，在網站參考了許多前輩的經驗，下面把開發中使用到的sql語句記錄下來，但願對你們有幫助。sql

 
       --獲取視圖信息和視圖描述信息comments 
      
       SELECT 
       C.COMMENTS, T.* 
      
       FROM 
       ALL_VIEWS T, ALL_TAB_COMMENTS C 
      
       WHERE 
       1 = 1 
      
       AND 
       T.VIEW_NAME = C.TABLE_NAME 
      
       AND 
       T.VIEW_NAME =  
       'VIEW_NAME'

 
       --獲取到視圖相關的字段，並查詢出字段是否可插入(insertable)、可更新(updatable)、可刪除(deletable)並查詢出注釋信息comments 
      
       SELECT 
       C.COMMENTS, T.*, U.UPDATABLE, U.INSERTABLE, U.DELETABLE 
      
       FROM 
       ALL_TAB_COLUMNS T, ALL_UPDATABLE_COLUMNS U, ALL_COL_COMMENTS C 
      
       WHERE 
       1 = 1 
      
       AND 
       U.TABLE_NAME = T.TABLE_NAME 
      
       AND 
       U.COLUMN_NAME = T.COLUMN_NAME 
      
       AND 
       C.TABLE_NAME = T.TABLE_NAME 
      
       AND 
       C.COLUMN_NAME = T.COLUMN_NAME 
      
       AND 
       T.TABLE_NAME =  
       'VIEWNAME'

 
       --查詢出視圖和表的依賴信息dependencies 
      
       SELECT 
       C.* 
      
       FROM 
       ALL_DEPENDENCIES C 
      
       WHERE 
       1 = 1 
      
       AND 
       C. 
       NAME 
       =  
       'VIEWNAME'

 
       --獲取數據庫中的表信息和表註釋comments 
      
       SELECT  
       C.COMMENTS, T.* 
      
       FROM  
       ALL_TABLES T, ALL_TAB_COMMENTS C 
      
       WHERE  
       1 = 1 
      
       AND  
       T.TABLE_NAME = C.TABLE_NAME 
      
       AND  
       T.TABLE_NAME =  
       'TABLE_NAME'

 
       --查詢出表中的列信息，包括列的註釋comments 
      
       SELECT 
       T.*, C.COMMENTS 
      
       FROM 
       ALL_TAB_COLUMNS T, ALL_COL_COMMENTS C 
      
       WHERE 
       T.TABLE_NAME = C.TABLE_NAME 
      
       AND 
       C.COLUMN_NAME = T.COLUMN_NAME 
      
       AND 
       T.TABLE_NAME =  
       'TABLE_NAME'

 
       --查詢出表的主鍵信息和主鍵所在的列名稱column_name 
      
       SELECT 
       A.COLUMN_NAME, C.* 
      
       FROM 
       ALL_CONSTRAINTS C, ALL_CONS_COLUMNS A 
      
       WHERE 
       C.CONSTRAINT_TYPE =  
       'P' 
      
       AND 
       C.CONSTRAINT_NAME = A.CONSTRAINT_NAME 
      
       AND 
       C.TABLE_NAME =  
       'TABLE_NAME'

 
       --獲取到外鍵的信息，包括外鍵所在的列名稱和外鍵所參照的主鍵的表名稱和主鍵所在的列的信息 
      
       SELECT 
       T2.R_COLUMN_NAME, T2.R_TABLE_NAME, T1.* 
      
       FROM 
       （ 
       SELECT 
       A1.COLUMN_NAME, C.* 
      
       FROM 
       ALL_CONSTRAINTS C, ALL_CONS_COLUMNS A1 
      
       WHERE 
       C.CONSTRAINT_TYPE =  
       'R' 
      
       AND 
       C.TABLE_NAME =  
       'TABLE_NAME' 
      
       AND 
       A1.CONSTRAINT_NAME = C.CONSTRAINT_NAME）T1, 
      
       ( 
       SELECT 
       A1.COLUMN_NAME  
       AS 
       R_COLUMN_NAME, 
      
       A1.TABLE_NAME  
       AS 
       R_TABLE_NAME, 
      
       C.* 
      
       FROM 
       ALL_CONSTRAINTS C, ALL_CONS_COLUMNS A1 
      
       WHERE 
       A1.CONSTRAINT_NAME = C.CONSTRAINT_NAME) T2 
      
       WHERE 
       T1.R_CONSTRAINT_NAME = T2.CONSTRAINT_NAME

 
       --查詢出表相關的檢查約束信息 
      
       SELECT 
       C.* 
      
       FROM 
       ALL_CONSTRAINTS C 
      
       WHERE 
       C.CONSTRAINT_TYPE =  
       'C' 
      
       AND 
       C.TABLE_NAME =  
       'TABLE_NAME'

 
       --查詢出表相關的惟一約束信息 
      
       SELECT 
       C.* 
      
       FROM 
       ALL_CONSTRAINTS C 
      
       WHERE 
       C.CONSTRAINT_TYPE =  
       'U' 
      
       AND 
       C.TABLE_NAME =  
       'TABLE_NAME'

 
       --表中的索引信息 
      
       SELECT 
       C.* 
      
       FROM 
       ALL_INDEXES C 
      
       WHERE 
       1 = 1 
      
       AND 
       C.TABLE_NAME =  
       'TABLE_NAME'

 
       --表與視圖的依賴信息 
      
       SELECT 
       C.* 
      
       FROM 
       ALL_DEPENDENCIES C 
      
       WHERE 
       1 = 1 
      
       AND 
       C.REFERENCED_NAME =  
       'TABLE_NAME'