diff --git a/pkg/reflection/helpers.go b/pkg/reflection/helpers.go
index fe9520c..cc6787f 100644
--- a/pkg/reflection/helpers.go
+++ b/pkg/reflection/helpers.go
@@ -17,3 +17,33 @@ func Len(v any) int {
 		return 0
 	}
 }
+
+// ExtractTableNameOnly extracts the table name from a fully qualified table reference.
+// It removes any schema prefix (e.g., "schema.table" -> "table") and truncates at
+// the first delimiter (comma, space, tab, or newline). If the input contains multiple
+// dots, it returns everything after the last dot up to the first delimiter.
+func ExtractTableNameOnly(fullName string) string {
+	// First, split by dot to remove schema prefix if present
+	lastDotIndex := -1
+	for i, char := range fullName {
+		if char == '.' {
+			lastDotIndex = i
+		}
+	}
+
+	// Start from after the last dot (or from beginning if no dot)
+	startIndex := 0
+	if lastDotIndex != -1 {
+		startIndex = lastDotIndex + 1
+	}
+
+	// Now find the end (first delimiter after the table name)
+	for i := startIndex; i < len(fullName); i++ {
+		char := rune(fullName[i])
+		if char == ',' || char == ' ' || char == '\t' || char == '\n' {
+			return fullName[startIndex:i]
+		}
+	}
+
+	return fullName[startIndex:]
+}
diff --git a/pkg/resolvespec/handler.go b/pkg/resolvespec/handler.go
index 65d20c8..5ded143 100644
--- a/pkg/resolvespec/handler.go
+++ b/pkg/resolvespec/handler.go
@@ -1209,7 +1209,7 @@ func (h *Handler) applyPreloads(model interface{}, query common.SelectQuery, pre
 			}
 
 			if len(preload.Where) > 0 {
-				sanitizedWhere := common.SanitizeWhereClause(preload.Where, preload.Relation)
+				sanitizedWhere := common.SanitizeWhereClause(preload.Where, reflection.ExtractTableNameOnly(preload.Relation))
 				if len(sanitizedWhere) > 0 {
 					sq = sq.Where(sanitizedWhere)
 				}
diff --git a/pkg/restheadspec/handler.go b/pkg/restheadspec/handler.go
index be1bdeb..40a395b 100644
--- a/pkg/restheadspec/handler.go
+++ b/pkg/restheadspec/handler.go
@@ -392,7 +392,7 @@ func (h *Handler) handleRead(ctx context.Context, w common.ResponseWriter, id st
 	if options.CustomSQLWhere != "" {
 		logger.Debug("Applying custom SQL WHERE: %s", options.CustomSQLWhere)
 		// Sanitize without auto-prefixing since custom SQL may reference multiple tables
-		sanitizedWhere := common.SanitizeWhereClause(options.CustomSQLWhere, "")
+		sanitizedWhere := common.SanitizeWhereClause(options.CustomSQLWhere, reflection.ExtractTableNameOnly(tableName))
 		if sanitizedWhere != "" {
 			query = query.Where(sanitizedWhere)
 		}
@@ -402,7 +402,7 @@ func (h *Handler) handleRead(ctx context.Context, w common.ResponseWriter, id st
 	if options.CustomSQLOr != "" {
 		logger.Debug("Applying custom SQL OR: %s", options.CustomSQLOr)
 		// Sanitize without auto-prefixing since custom SQL may reference multiple tables
-		sanitizedOr := common.SanitizeWhereClause(options.CustomSQLOr, "")
+		sanitizedOr := common.SanitizeWhereClause(options.CustomSQLOr, reflection.ExtractTableNameOnly(tableName))
 		if sanitizedOr != "" {
 			query = query.WhereOr(sanitizedOr)
 		}
@@ -481,7 +481,7 @@ func (h *Handler) handleRead(ctx context.Context, w common.ResponseWriter, id st
 		// Apply cursor filter to query
 		if cursorFilter != "" {
 			logger.Debug("Applying cursor filter: %s", cursorFilter)
-			sanitizedCursor := common.SanitizeWhereClause(cursorFilter, "")
+			sanitizedCursor := common.SanitizeWhereClause(cursorFilter, reflection.ExtractTableNameOnly(tableName))
 			if sanitizedCursor != "" {
 				query = query.Where(sanitizedCursor)
 			}
@@ -655,7 +655,7 @@ func (h *Handler) applyPreloadWithRecursion(query common.SelectQuery, preload co
 
 		// Apply WHERE clause
 		if len(preload.Where) > 0 {
-			sanitizedWhere := common.SanitizeWhereClause(preload.Where, preload.Relation)
+			sanitizedWhere := common.SanitizeWhereClause(preload.Where, reflection.ExtractTableNameOnly(preload.Relation))
 			if len(sanitizedWhere) > 0 {
 				sq = sq.Where(sanitizedWhere)
 			}