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my-test/src/main/java/org/example/join/sql/Sql.java

@@ -111,12 +111,19 @@ public class Sql implements IFormat {
         List<QueryColumn> groupByList = sql.groupByList;
         List<QueryConditionOrder> orderByList = sql.orderByList;
 
-        // select fields from table join table on
-        StringBuilder sqlBuilder = new StringBuilder()
-                .append(SqlConstant.SELECT)
-                .append(listFormatSql(queryFieldsList, StringPool.COMMA))
-                .append(SqlConstant.FROM)
-                .append(getQueryTablesSql(queryTableList));
+        // select
+        StringBuilder sqlBuilder = new StringBuilder().append(SqlConstant.SELECT);
+
+        // fields
+        String queryFields = listFormatSql(queryFieldsList, StringPool.COMMA);
+        if (StrUtil.isBlank(queryFields)) {
+            sqlBuilder.append(StringPool.ASTERISK);
+        } else {
+            sqlBuilder.append(queryFields);
+        }
+
+        // from table join table on
+        sqlBuilder.append(SqlConstant.FROM).append(getQueryTablesSql(queryTableList));
 
         // where 条件
         String where = listFormatSql(queryConditionList, SqlConstant.AND);