diff --git a/clickhouse/columns/string.cpp b/clickhouse/columns/string.cpp
index 8ea362c4..569a2b5c 100644
--- a/clickhouse/columns/string.cpp
+++ b/clickhouse/columns/string.cpp
@@ -30,6 +30,20 @@ ColumnFixedString::ColumnFixedString(size_t n)
 {
 }
 
+ColumnFixedString::ColumnFixedString(size_t n, const std::vector<std::string_view>& data)
+    : ColumnFixedString(n)
+{
+    for (const auto& v : data)
+        Append(v);
+}
+
+ColumnFixedString::ColumnFixedString(size_t n, const std::vector<std::string>& data)
+    : ColumnFixedString(n)
+{
+    for (const auto& v : data)
+        Append(v);
+}
+
 void ColumnFixedString::Append(std::string_view str) {
     if (str.size() > string_size_) {
         throw ValidationError("Expected string of length not greater than "
diff --git a/clickhouse/columns/string.h b/clickhouse/columns/string.h
index f2216f40..38d5a584 100644
--- a/clickhouse/columns/string.h
+++ b/clickhouse/columns/string.h
@@ -19,14 +19,10 @@ class ColumnFixedString : public Column {
 
     explicit ColumnFixedString(size_t n);
 
-    template <typename Values>
-    ColumnFixedString(size_t n, const Values & values)
-        : ColumnFixedString(n)
-    {
-        for (const auto & v : values)
-            Append(v);
-    }
+    explicit ColumnFixedString(size_t n, const std::vector<std::string_view>& data);
 
+    explicit ColumnFixedString(size_t n, const std::vector<std::string>& data);
+      
     /// Appends one element to the column.
     void Append(std::string_view str);
 
diff --git a/clickhouse/query.cpp b/clickhouse/query.cpp
index 3986064c..aa73b818 100644
--- a/clickhouse/query.cpp
+++ b/clickhouse/query.cpp
@@ -2,8 +2,6 @@
 
 namespace clickhouse {
 
-const std::string Query::default_query_id = {};
-
 Query::Query()
 { }
 
diff --git a/clickhouse/query.h b/clickhouse/query.h
index ae98690d..41d4ef54 100644
--- a/clickhouse/query.h
+++ b/clickhouse/query.h
@@ -116,7 +116,7 @@ class Query : public QueryEvents {
         return *this;
     }
 
-    static const std::string default_query_id;
+    static constexpr char default_query_id[] = "";
 
 private:
     void OnData(const Block& block) override {