SELECT 語句

SELECT 是一個 Open-SQL 語句，用於將資料從一個或多個資料庫表讀取到資料物件中 。

1. 選擇所有記錄

   * This returns all records into internal table lt_mara.
   SELECT * FROM mara
            INTO lt_mara.
   

2. 選擇單個記錄

   * This returns single record if table consists multiple records with same key.
   SELECT SINGLE * INTO TABLE lt_mara
                   FROM mara
                   WHERE matnr EQ '400-500'.
   

3. 選擇不同的記錄

   * This returns records with distinct values.
   SELECT DISTINCT * FROM mara
                     INTO TABLE lt_mara
                     ORDER BY matnr.
   

4. 聚合函式

   * This puts the number of records present in table MARA into the variable lv_var 
   SELECT COUNT( * ) FROM mara
                     INTO lv_var.