I want to get a variable in typoscript select Query

The title says it all; I need a Typoscript SQL SELECT query with a dynamic WHERE clause.

I get the UID of the current logged in user with:

data = TSFE:fe_user|user|uid

But how can I use that in a database query?

I store the UID in a typoscript variable named {userID}.

That's my code so far. The Problem is Typoscript just merge the two values:

// User One has value: 50
// User Two has value: 32
// With this code the output is : 5032 ????

    lib.coins = CONTENT
    lib.coins {
        table = fe_users
        select {
            pidInList = 18
            where = uid
            andWhere.insertData = TSFE:fe_user|user|uid
            selectFields = coins
        }
        renderObj = COA
        renderObj {
            1 = TEXT
            1.field = coins
    
        }
    }

You should make use of the select option markers:

lib.coins = CONTENT
lib.coins {
    table = fe_users
    select {
        selectFields = coins
        pidInList = 18
        where = uid = ###UID###

        markers {
            UID.data = TSFE:fe_user|user|uid
        }
    }
    renderObj = COA
    renderObj {
        1 = TEXT
        1.field = coins
    }
}