Updates

src/types/index.ts

@@ -715,7 +715,7 @@ export type ServerQueryParam<
     /**
      * Raw SQL to use as select
      */
-    select_sql?: string;
+    // select_sql?: string;
     [key: string]: any;
 };
 
@@ -902,7 +902,18 @@ export type ServerQueryParamsJoin<
     /**
      * Raw SQL to use as join select
      */
-    select_sql?: string;
+    // select_sql?: string;
+    /**
+     * Concatenate multiple matches from another table
+     */
+    group_concat?: {
+        field: string;
+        alias: string;
+        /**
+         * Separator. Default `,`
+         */
+        separator?: string;
+    };
 };
 
 /**

src/utils/sql-generator.ts

@@ -312,8 +312,9 @@ export default function sqlGenerator<
                             return null;
                         existingJoinTableNames.push(joinTableName);
 
-                        if (joinObj.select_sql) {
-                            return joinObj.select_sql;
+                        if (joinObj.group_concat) {
+                            let group_concat = `GROUP_CONCAT(${joinTableName}.${joinObj.group_concat.field}, ${joinObj.group_concat.separator || ","}) AS ${joinObj.group_concat.alias}`;
+                            return group_concat;
                         } else if (joinObj.selectFields) {
                             return joinObj.selectFields
                                 .map((selectField) => {