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        <title>Decimal128 - 标签 - 五岁博客</title>
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    <title>ClickHouse 求和后 Decimal 为何变 Decimal128？</title>
    <link>https://fiveyoboy.com/articles/clickhouse-decimal-sum-cast-decimal128/</link>
    <pubDate>Tue, 15 Sep 2026 00:00:00 &#43;0000</pubDate>
    <author>五岁博客</author>
    <guid>https://fiveyoboy.com/articles/clickhouse-decimal-sum-cast-decimal128/</guid>
    <description><![CDATA[<p>对一个 <code>Decimal(18,8)</code> 列执行 <code>sum</code>，拿出来的结果类型却变成了 <code>Decimal(38,8)</code>。</p>
<p>如果你用的是 clickhouse-go 老版本，紧接着就会看到一行报错：<code>Decimal128 is not supported</code>。</p>
<p>这事我自己踩过。</p>
<p>当时查的是库存金额，建表时字段明明写的 <code>Decimal(18,8)</code>，聚合一下程序就崩了，盯着错误日志愣了好一会儿。</p>]]></description>
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