if-statement - 带有 FOR 循环 db2 plsql 的 IF 条件

Question

我正在 db2 上创建一个过程，仅当表为空时才会将值插入表中。我创建了以下语句，但是由于出现错误，因此出现了问题：

[42601][-104] An unexpected token "END-OF-STATEMENT" was found
following "END FOR". 
Expected tokens may include: " END IF".. SQLCODE=-104, SQLSTATE=42601,
DRIVER=4.7.85

create or REPLACE PROCEDURE proc1
BEGIN
IF (exists (select 1 from table1)) then
TRUNCATE TABLE table1;
ELSE
FOR l1 as
select id, max(bla) as bla from table2 group by id
do
insert into table1 (column1, column2)
values (id, bla);
END FOR;
END IF;
END;

谢谢！

Answer 1

显然，这个小改动有助于解决问题：

create or REPLACE PROCEDURE proc1
BEGIN
IF (exists (select 1 from table1)) then
DELETE FROM TABLE table1;
END IF;
FOR l1 as
select id, max(bla) as bla from table2 group by id
do
insert into table1 (column1, column2)
values (id, bla);
END FOR;
END;

Answer 2

为什么你不这样做

create or REPLACE PROCEDURE proc1
BEGIN

DELETE FROM table1;

insert into table1 (column1, column2)
select id, max(bla) from table2 group by id;

END;