2つの長い行Oracle SQLを比較します

Question

私は2つのテーブルAとBと言う（テーブルBはAの前のバックアップテーブルです）。どちらの列も同じ列を持ち（どちらの表でも）、どちらの列もデータ型がLONGです。

Columns : ID and RECORD 

私は両方のテーブルを比較したい（または同じIDを持っていない場合があります）、その結果が提供する必要があります。

1. 同じIDが異なるRECORDと、
2. 同じRECORDが異なるIDを。

Answer 1

長く使用する前に、LONGに関する事実はほとんど分かりません。

LONG値の使用は、これらの制限を受けている：あなたが比較ですのいずれかの種類を行うための周り

1 A table can contain only one LONG column. 
2 You cannot create an object type with a LONG attribute. 
3 LONG columns cannot appear in WHERE clauses or in integrity constraints (except that they can appear in NULL and NOT NULL constraints). 
4 LONG columns cannot be indexed. 
5 LONG data cannot be specified in regular expressions. 
6 A stored function cannot return a LONG value. 
7 You can declare a variable or argument of a PL/SQL program unit using the LONG data type. However, you cannot then call the program unit from SQL. 
8 Within a single SQL statement, all LONG columns, updated tables, and locked tables must be located on the same database. 
9 LONG and LONG RAW columns cannot be used in distributed SQL statements and cannot be replicated. 
10 If a table has both LONG and LOB columns, then you cannot bind more than 4000 bytes of data to both the LONG and LOB columns in the same SQL statement. However, you can bind more than 4000 bytes of data to either the LONG or the LOB column. 

IN ADDITION, LONG COLUMNS CANNOT APPEAR IN THESE PARTS OF SQL STATEMENTS: 

1 GROUP BY clauses, ORDER BY clauses, or CONNECT BY clauses or with the DISTINCT operator in SELECT statements 
2 The UNIQUE operator of a SELECT statement 
3 The column list of a CREATE CLUSTER statement 
4 The CLUSTER clause of a CREATE MATERIALIZED VIEW statement 
5 SQL built-in functions, expressions, or conditions 
6 SELECT lists of queries containing GROUP BY clauses 
7 SELECT lists of subqueries or queries combined by the UNION, INTERSECT, or MINUS set operators 
8 SELECT lists of CREATE TABLE ... AS SELECT statements 
9 ALTER TABLE ... MOVE statements 
10 SELECT lists in subqueries in INSERT statements 

仕事はCLOBとして長い列を持つビューを作成し、任意の操作を行うことです。以下を確認してください。

create table B(ID number, RECRD long) 

create table A(ID number, RECRD long) 

select recrd from A where recrd = '12345' 

--This will throw error "illegal use of LONG datatype 

WORK AROUND : 

SQL> CREATE TABLE A_view 
    AS 
    SELECT id, 
      TO_LOB(recrd) AS recrd 
    FROM A; 


SQL> CREATE TABLE B_view 
    AS 
    SELECT id, 
      TO_LOB(recrd) AS recrd 
    FROM B; 


select * from A_view where DBMS_LOB.substr(recrd) = '12345' 


drop table a; 

drop table b; 

drop table a_view; 

drop table b_view;