diff --git a/R/Table.R b/R/Table.R
index 0093ef80..a2681c98 100644
--- a/R/Table.R
+++ b/R/Table.R
@@ -70,7 +70,7 @@ odbc_write_table <-
     fieldDetails <- tryCatch({
       details <- odbcConnectionColumns(conn, name)
       details$param_index <- match(details$name, names(values))
-      details[!is.na(details$param_index), ]
+      details[!is.na(details$param_index) & !is.na(details$data_type), ]
     }, error = function(e) {
       return(NULL)
     })
@@ -79,7 +79,8 @@ odbc_write_table <-
 
       name <- dbQuoteIdentifier(conn, name)
       fields <- dbQuoteIdentifier(conn, names(values))
-      params <- rep("?", length(fields))
+      nparam <- length(fields)
+      params <- rep("?", nparam)
 
       sql <- paste0(
         "INSERT INTO ", name, " (", paste0(fields, collapse = ", "), ")\n",
@@ -87,7 +88,7 @@ odbc_write_table <-
         )
       rs <- OdbcResult(conn, sql)
 
-      if (!is.null(fieldDetails) && nrow(fieldDetails)) {
+      if (!is.null(fieldDetails) && nrow(fieldDetails) == nparam) {
         result_describe_parameters(rs@ptr, fieldDetails)
       }
 
diff --git a/R/db.R b/R/db.R
index 22df8294..db06eff9 100644
--- a/R/db.R
+++ b/R/db.R
@@ -61,7 +61,8 @@ setMethod(
       owner AS \"schema_name\",
       null AS \"catalog_name\",
       null AS \"data_type\",
-      decode(data_type,'CHAR',char_length,'NCHAR',char_length, 'VARCHAR2',char_length,'NVARCHAR2',char_length, 'RAW',data_length, 'ROWID', data_length, 'UNDEFINED', 0, data_precision) AS \"column_size\", decode(data_type, 'DATE',16,'FLOAT',8,'BINARY_FLOAT',4,'BINARY_DOUBLE',8,'LONG RAW',2147483647,'LONG',2147483647,'CLOB',2147483647,'NCLOB',2147483647,'BLOB',2147483647,'BFILE',2147483647,'CHAR',data_length,'NCHAR',data_length,'VARCHAR2',data_length,'NVARCHAR2',data_length,'NUMBER',NVL(data_precision+2,40),data_length) AS \"buffer_length\",
+      decode(data_type,'CHAR',char_length,'NCHAR',char_length, 'VARCHAR2',char_length,'NVARCHAR2',char_length, 'RAW',data_length, 'ROWID', data_length, 'UNDEFINED', 0, data_precision) AS \"column_size\",
+      decode(data_type, 'DATE',16,'FLOAT',8,'BINARY_FLOAT',4,'BINARY_DOUBLE',8,'LONG RAW',2147483647,'LONG',2147483647,'CLOB',2147483647,'NCLOB',2147483647,'BLOB',2147483647,'BFILE',2147483647,'CHAR',data_length,'NCHAR',data_length,'VARCHAR2',data_length,'NVARCHAR2',data_length,'NUMBER',NVL(data_precision+2,40),data_length) AS \"buffer_length\",
       data_scale AS \"decimal_digits\",
       null AS \"numeric_precision_radix\",
       null AS \"remarks\",