Query Targets

PostgreSQL 7.3.4 Documentation
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# 7.4. Query Targets

Values to be inserted into a table are coerced to the destination column's data type according to the following steps.

Query Target Type Resolution

1. Check for an exact match with the target.

2. Otherwise, try to coerce the expression to the target type. This will succeed if the two types are known binary-compatible, or if there is a conversion function. If the expression is an unknown-type literal, the contents of the literal string will be fed to the input conversion routine for the target type.

3. If the target is a fixed-length type (e.g. `char` or `varchar` declared with a length) then try to find a sizing function for the target type. A sizing function is a function of the same name as the type, taking two arguments of which the first is that type and the second is an integer, and returning the same type. If one is found, it is applied, passing the column's declared length as the second parameter.

Example 7-6. `character` Storage Type Conversion

For a target column declared as `character(20)` the following query ensures that the target is sized correctly:

    tgl=> CREATE TABLE vv (v character(20));
    CREATE
    tgl=> INSERT INTO vv SELECT 'abc' || 'def';
    INSERT 392905 1
    tgl=> SELECT v, length(v) FROM vv;
              v           | length
    ----------------------+--------
     abcdef               |     20
    (1 row)

What has really happened here is that the two unknown literals are resolved to `text` by default, allowing the || operator to be resolved as `text` concatenation. Then the `text` result of the operator is coerced to `bpchar` ("blank-padded char", the internal name of the character data type) to match the target column type. (Since the parser knows that `text` and `bpchar` are binary-compatible, this coercion is implicit and does not insert any real function call.) Finally, the sizing function bpchar(bpchar, integer) is found in the system catalogs and applied to the operator's result and the stored column length. This type-specific function performs the required length check and addition of padding spaces.

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