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diff --git a/lib/analysers/query.mli b/lib/analysers/query.mli
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+module Syntax = ImportConf.Syntax
+
+val create_table : Dependency.t -> string
+
+type query = {
+  q : string;  (** The query to execute *)
+  parameters : ImportCSV.DataType.t Seq.t;
+}
+(** This type represent a query to execute. 
+    [q] is the template to run, and shall be run with all the binded parameters.
+ *)
+
+val select :
+  Syntax.t -> query * ImportDataTypes.Path.t ImportExpression.T.t array
+
+val check_external : Syntax.t -> Syntax.extern -> query
+(** Create a query which select all the missing key in an external *)
+
+val build_key_insert : Buffer.t -> Dependency.key -> unit
+(* Build the fragment insert query.
+
+   This use prepare statement and apply the function at the insert time, in
+   order to have the key already in the expected format in the database.
+
+   The column are name :col_XX where XX is the index of the column in the
+   datasheet (starting from 1)
+*)