O SQLServer like e o charindex () implementam consultas difusas

//sql语句
Create table Users(
    username varchar(20) primary key,
    password varcahr(20)
)

1, gostaria de conseguir consulta difusa

select * from Users where username like "%123%"

2. Charindex () realiza uma consulta difusa

select * from Users where charindex(username,'1234,567')>0