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Id
15384552
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0
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0
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1
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CreationDate
2013-03-13T11:53:11.550
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2018-05-18T10:52:35.140
LastEditDate
2018-05-18T10:52:35.140
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4632019
OwnerUserId
623041
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15384429
PostTypeId
2
Score
21
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text
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As documented under <a href="http://dev.mysql.com/doc/en/data-type-defaults.html" rel="nofollow noreferrer">Data Type Default Values</a>: <blockquote> The <code>DEFAULT value</code> clause in a data type specification indicates a default value for a column. With one exception, the default value must be a constant; it cannot be a function or an expression. This means, for example, that you cannot set the default for a date column to be the value of a function such as <a href="http://dev.mysql.com/doc/en/date-and-time-functions.html#function_now" rel="nofollow noreferrer"><code>NOW()</code></a> or <a href="http://dev.mysql.com/doc/en/date-and-time-functions.html#function_current-date" rel="nofollow noreferrer"><code>CURRENT_DATE</code></a>. The exception is that you can specify <a href="http://dev.mysql.com/doc/en/date-and-time-functions.html#function_current-timestamp" rel="nofollow noreferrer"><code>CURRENT_TIMESTAMP</code></a> as the default for a <a href="http://dev.mysql.com/doc/en/datetime.html" rel="nofollow noreferrer"><code>TIMESTAMP</code></a> column. See <a href="http://dev.mysql.com/doc/en/timestamp-initialization.html" rel="nofollow noreferrer">Section 11.3.5, “Automatic Initialization and Updating for <code>TIMESTAMP</code>”</a>. </blockquote> Instead, you can define an insertion trigger: <pre><code>CREATE TRIGGER foo BEFORE INSERT ON TSM_TRANSACTION_TBL FOR EACH ROW IF NEW.REMAINING IS NULL THEN SET NEW.REMAINING := NEW.MAX_VALUE - NEW.BOOKED_UNITS; END IF;; </code></pre>
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1. POmysql set field default value to other column
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1. COI used your code but it told me that i can not use new with after insert and i changed it to before and it is working perfectly
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