SQL数据库多个表格中，从3个表格中根据条件，提取字段的一个问题
\u5728sql\u4e2d \u80fd\u4e0d\u80fd\u628a\u4ece\u540c\u4e00\u5f20\u8868\u4e2d\uff0c\u6839\u636e\u4e0d\u540c\u7684\u6761\u4ef6\uff0c\u67e5\u8be2\u51fa\u7684\u4e00\u4e2a\u5b57\u6bb5\u7684\u4e0d\u540c\u7684\u503c \u5206\u6210\u51e0\u4e2a\u5217\u663e\u793a\u51fa\u6765\uff1f\u7528\u4e00\u8868\u62c6\u591a\u8868\uff0c\u4e3e\u4f8b\uff1aselect a1.c,a2.c from a a1,a a2
pc_id,screen_id\u54ea\u4e2a\u4f18\u5148\uff1f\u4ee5pc_id\u4f18\u5148\u4e3a\u4f8b\uff1a
oracle\u7528decode\u51fd\u6570\uff0csqlserver\u53ef\u4ee5\u7528case...when\uff0c\u7ed9\u4f60\u4e2aoracle\u7684\u4f8b\u5b50
create procedure add_table
is
begin
insert into wip_led_opration(operation_id,led_pc_id,led_screen_id)
select operation_id,led_pc_id, decode(led_pc_id,null,led_screen_id,null)
-- \u903b\u8f91\uff1a\u7b2c\u4e09\u5217led_screen_id\uff0c\u5148\u5224\u65adled_pc_id\u662f\u5426\u4e3a\u7a7a\uff0c\u4e3a\u7a7a\u5219\u7528led_screen_id\uff0c\u975e\u7a7a\u5373led_pc_id\u5b58\u5728\uff0c\u5219led_screen_id\u5217\u4f4d\u7f6e\u7559\u7a7a
from fnd_led_pc ,fnd_led_screen ,fnd_operation
where fnd_operation.status=1
and fnd_led_screen.status=1
and fnd_led_pc.status=1
-- and fnd_operation.status=fnd_led_screen.status --\u8fd9\u4e2a\u6761\u4ef6\u662f\u591a\u4f59\u7684\uff0c\u4e24\u4e2a\u503c\u90fd=1\u4e86
and fnd_led_screen.status=fnd_led_pc.status ;
end;
/* \u53e6\u5916\u63d0\u51e0\u70b9\u5efa\u8bae
1. \u5efa\u8bae\u7ed9\u4e09\u4e2a\u8868\u52a0\u4e0a\u522b\u540d
2. \u591a\u4f59\u7684\u8fde\u63a5\u6761\u4ef6\u6211\u6ce8\u91ca\u6389\u4e86\uff0c\u867d\u7136\u5bf9\u6267\u884c\u8ba1\u5212\u5e94\u8be5\u6ca1\u6709\u592a\u5927\u5f71\u54cd
3. SELECT\u540e\u6700\u597d\u6807\u8bc6\u51fa\u6e90\u8868\uff0c\u6bd4\u5982fnd_operation.operation_id\uff0c\u8fd9\u6837\u81ea\u5df1\u770b\u7740\u4e5f\u6e05\u695a
*/
具体分析为什么inner join会不显示包装工序。是因为员工表中包装工序没有添加相应的员工。因为在员工表中找不到对应记录。无法显示产品表中这个包装工序。
代码是：select dingdan.chanpinxinghao,gsmx.gxname,dingdan.pingshenhao from dingdan left join gsmx on dingdan.chanpinxinghao=gsmx.chanpinxinghao left join yuangong on gsmx.gxname=yuangong.gxname where dingdan.dangqianzhuangtai="已投产"
select * from 表名 where 条件
补充一下问题吧，我等通知了。
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