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PODB Error=ORA-01407: cannot update ("XXX"."XXX"."VALUE") to NULL.
 

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    <p>I have (simplified for this question) a table 'TAB' with two columns 'id' (integer and not null in db) and 'value' (varchar and not null in db). I am using a java application to update 'value' column for multiple rows in one go (which is my requirement). I have used update statement with case and when keyword. The query is being generated at runtime depending on number of rows modified. </p> <p>The query works fine if data is updated for all rows together, but it gives me error when updated for less rows. Say we have three rows with id = 1, 2 and 3 with values A ,B and C resp.<br> When the query is fired for all three rows together then it works fine </p> <pre><code>UPDATE TAB set value = CASE WHEN id = 1 THEN 'X' WHEN id = 2 THEN 'Y' WHEN id = 3 THEN 'Z' END </code></pre> <p>But when the query is fired for less than three rows then I am encountering with a DB error. </p> <pre><code>UPDATE TAB set value = CASE WHEN id = 1 THEN 'X' END </code></pre> <p>Results in following error:</p> <blockquote> <p>DB Error=ORA-01407: cannot update ("XXX"."XXX"."VALUE") to NULL.</p> </blockquote> <p>I know this is happening because the 'value' column is not null in DB. I want to know whether the above query is trying to update all the remaining values with NULL? </p> <p>The query works fine if I add ELSE part as written below.</p> <pre><code>UPDATE TAB set value = CASE WHEN id = 1 THEN 'X' ELSE TAB.value END </code></pre> <p>Will the above query impact any performance issue, if there are multiple rows in DB.</p>
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    1. USvishal Kumar
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