set @address='中國(guó)-山東省-聊城市-莘縣';
select @address

select length('a')
,char_length('a')
,length('中')
,char_length('中')

set @address='中國(guó)-山東省-聊城市-莘縣';
select @address
,replace(@address,'-','') as address_1
,length(@address) as len_add1
,length(replace(@address,'-','')) as len_add2
,length(@address)-length(replace(@address,'-','')) as _count

select max(length(com_industry)-length(replace(com_industry,'-',''))) as _max_count
from etl1_socom_data

set @address='中國(guó)-山東省-聊城市-莘縣';
select 
substring_index(@address,'-',1) as china,
substring_index(substring_index(@address,'-',2),'-',-1) as province,
substring_index(substring_index(@address,'-',3),'-',-1) as city,
substring_index(@address,'-',-1) as district

case when then when then else 值 end as 字段名

select case when 89>101 then '大于' else '小于' end as betl1_socom_data

select a.*,
case when com_district like '%業(yè)' or com_district like '%織' or com_district like '%育' then null else com_district end as com_district1
,case when com_district like '%業(yè)' or com_district like '%織' or com_district like '%育' then concat(com_district,'-',com_industry) else com_industry end as com_industry_total
,replace(com_addr,'地 址：','') as com_addr1
,replace(com_phone,'電 話：','') as com_phone1
,replace(com_fax,'傳 真：','') as com_fax1
,replace(com_mobile,'手機(jī)：','') as com_mobile1
,replace(com_url,'網(wǎng)址：','') as com_url1
,replace(com_email,'郵箱：','') as com_email1
,replace(com_contactor,'聯(lián)系人：','') as com_contactor1
,replace(com_emploies_nums,'公司人數(shù)：','') as com_emploies_nums1
,replace(com_reg_capital,'注冊(cè)資金：萬(wàn)','') as com_reg_capital1
,replace(com_type,'經(jīng)濟(jì)類型：','') as com_type1
,replace(com_product,'公司產(chǎn)品：','') as com_product1
,replace(com_desc,'公司簡(jiǎn)介：','') as com_desc1
from s_socom_data as a

select a.*,
case 
#行業(yè)為''的值 置為空
when length(com_industry)=0 then null
#其他的取第一個(gè)-分隔符之前
else substring_index(com_industry,'-',1) end as com_industry1,
case 
when length(com_industry)-length(replace(com_industry,'-',''))=0 then null
#'交通運(yùn)輸、倉(cāng)儲(chǔ)和郵政業(yè)-' 這種值 行業(yè)2 也置為null
when length(com_industry)-length(replace(com_industry,'-',''))=1 and length(substring_index(com_industry,'-',-1))=0 then null
when length(com_industry)-length(replace(com_industry,'-',''))=1 then substring_index(com_industry,'-',-1)
else substring_index(substring_index(com_industry,'-',2),'-',-1)
end as com_industry2,
case 
when length(com_industry)-length(replace(com_industry,'-',''))<=1 then null
when length(com_industry)-length(replace(com_industry,'-',''))=2 then substring_index(com_industry,'-',-1)
else substring_index(substring_index(com_industry,'-',3),'-',-1)
end as com_industry3,
case 
when length(com_industry)-length(replace(com_industry,'-',''))<=2 then null
else substring_index(com_industry,'-',-1)
end as com_industry4
from etl1_socom_data as a

select count(1) from s_socom_data
union all
select count(1) from etl1_socom_data
union all
select count(1) from etl2_socom_data

select * 
from etl2_socom_data 
where com_district is null and length(com_industry)-length(replace(com_industry,'-',''))=3