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  1. PO
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    <p>It won't be fast, and there will be a lot for you to type (unless you generate the SQL from user_tab_columns), but here is what I use when I need to compare two tables row-by-row and column-by-column.</p> <p>The query will return all rows that</p> <ul> <li>Exists in table1 but not in table2</li> <li>Exists in table2 but not in table1</li> <li>Exists in both tables, but have at least one column with a different value</li> </ul> <p>(common identical rows will be excluded).</p> <p>"PK" is the column(s) that make up your primary key. "a" will contain A if the present row exists in table1. "b" will contain B if the present row exists in table2.</p> <pre><code>select pk ,decode(a.rowid, null, null, 'A') as a ,decode(b.rowid, null, null, 'B') as b ,a.col1, b.col1 ,a.col2, b.col2 ,a.col3, b.col3 ,... from table1 a full outer join table2 b using(pk) where decode(a.col1, b.col1, 1, 0) = 0 or decode(a.col2, b.col2, 1, 0) = 0 or decode(a.col3, b.col3, 1, 0) = 0 or ...; </code></pre> <p><strong>Edit</strong> Added example code to show the difference described in comment. Whenever one of the values contains NULL, the result will be different.</p> <pre><code>with a as( select 0 as col1 from dual union all select 1 as col1 from dual union all select null as col1 from dual ) ,b as( select 1 as col1 from dual union all select 2 as col1 from dual union all select null as col1 from dual ) select a.col1 ,b.col1 ,decode(a.col1, b.col1, 'Same', 'Different') as approach_1 ,case when a.col1 &lt;&gt; b.col1 then 'Different' else 'Same' end as approach_2 from a,b order by a.col1 ,b.col1; col1 col1_1 approach_1 approach_2 ==== ====== ========== ========== 0 1 Different Different 0 2 Different Different 0 null Different Same &lt;--- 1 1 Same Same 1 2 Different Different 1 null Different Same &lt;--- null 1 Different Same &lt;--- null 2 Different Same &lt;--- null null Same Same </code></pre>
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    1. POHow to compare two tables column by column in oracle
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    1. USRonnis
    1. USRonnis
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    1. COHi Ronnis,can you please describe what does decode command do in your code?
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      1. USM_Mogharrabi
    2. COIt's a way around the problem with nulls. If for example "col1" was null in one of the tables, I wouldn't detect the mismatch by using "a.col1 <> b.col1". I'm exploiting the fact that DECODE treats NULL as equal to NULL.
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      1. USRonnis
    3. COIt could be fast enough. I just did this on 12 schemas, with a total of 500 tables, a total of 3 millions rows, across a database link, and it finished comparing all tables (and synchronizing the target) in less than 10 minutes.
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      1. USTony BenBrahim
 

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