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docs: Only first instance of a PREPARE parameter sets data type
If the first reference to $1 is "($1 = col) or ($1 is null)", the data type can be determined, but not for "($1 is null) or ($1 = col)". This change documents this. Reported-by: Morgan Owens Discussion: https://postgr.es/m/153233728858.1404.15268121695358514937@wrigleys.postgresql.org Backpatch-through: 9.3
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@ -52,7 +52,7 @@ PREPARE <replaceable class="parameter">name</replaceable> [ ( <replaceable class
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parameter data types can optionally be specified. When a
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parameter's data type is not specified or is declared as
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<literal>unknown</literal>, the type is inferred from the context
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in which the parameter is used (if possible). When executing the
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in which the parameter is first referenced (if possible). When executing the
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statement, specify the actual values for these parameters in the
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<command>EXECUTE</command> statement. Refer to <xref
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linkend="sql-execute"/> for more
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@ -104,7 +104,7 @@ PREPARE <replaceable class="parameter">name</replaceable> [ ( <replaceable class
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The data type of a parameter to the prepared statement. If the
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data type of a particular parameter is unspecified or is
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specified as <literal>unknown</literal>, it will be inferred
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from the context in which the parameter is used. To refer to the
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from the context in which the parameter is first referenced. To refer to the
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parameters in the prepared statement itself, use
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<literal>$1</literal>, <literal>$2</literal>, etc.
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</para>
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