pg_attrdef #The catalog pg_attrdef stores column default expressions and generation expressions. The main information about columns is stored in pg_attribute. Only columns for which a default expression or generation expression has been explicitly set will have an entry here.
Table 52.6. pg_attrdef Columns
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Column Type Description |
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Row identifier |
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The table this column belongs to |
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The number of the column |
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The column default or generation expression, in |