mysql行转列

QL语句

SELECT
    mi.intf_file,
    change_typeFROM tb_mr_info miWHERE mi.intf_file IN (
        'app_mmgr.h',
        'arp_mim_dynclass_pub.h'
    )

 

表数据

intf_filechange_type

app_mmgr.hadd

app_mmgr.hmodify

arp_mim_dynclass_pub.hmodify

arp_mim_dynclass_pub.hdelete

arp_mim_dynclass_pub.hmodify

arp_mim_dynclass_pub.hmodify

arp_mim_dynclass_pub.hmodify

arp_mim_dynclass_pub.hdelete

arp_mim_dynclass_pub.hmodify

arp_mim_dynclass_pub.hmodify

使用group_concat()函数，按指定字段进行分组，同一分组内按某一字段合并，默认用逗号分隔

SELECT
mi.intf_file,
group_concat(mi.change_type) change_typeFROM tb_mr_info miWHERE mi.intf_file IN (
'app_mmgr.h',
'arp_mim_dynclass_pub.h'
)
GROUP BY
mi.intf_file

执行结果

intf_filechange_type

app_mmgr.hadd,modifyarp_mim_dynclass_pub.hmodify,delete,modify,modify,modify,delete,modify,modify

对合并结果去重

SELECT
mi.intf_file,group_concat(distinct mi.change_type) change_typeFROM
tb_mr_info miWHERE
mi.intf_file IN ('app_mmgr.h','arp_mim_dynclass_pub.h'
)GROUP BY
mi.intf_file

执行结果

intf_filechange_type

app_mmgr.hadd,modify

arp_mim_dynclass_pub.hmodify,delete

指定分隔符

group_concat(distinct mi.change_type separator ' | ') change_type

执行结果

intf_filechange_type

app_mmgr.hadd | modifyarp_mim_dynclass_pub.hmodify | delete

合并并排序

SELECT
    mi.intf_file,
    group_concat(mi.id ORDER BY mi.id),
    group_concat(
        DISTINCT mi.change_type
        ORDER BY
            mi.id SEPARATOR ' | '
    ) change_typeFROM tb_mr_info miWHERE mi.intf_file IN (
        'app_mmgr.h',
        'arp_mim_dynclass_pub.h'
    )
GROUP BY
    mi.intf_file

执行结果

intf_filegroup_concat(mi.id order by mi.id)change_type

app_mmgr.h3982,3983add | modify

arp_mim_dynclass_pub.h4659,4660,4661,4662,4665,4666,4667,4668delete | modify