How can I use SQL to define a segment based on the ledger?

Summary:

The client has two ledgers and one of them has only one company - "01". I would like the value for company to already be filled in in this company's ledger and I created the following SQL:

select '01' from GL_LEDGERS

Where NAME = 'Ledger name'

With this, it is bringing the "01" to both ledgers. Is the code wrong? Does this SQL option within Instance work for this scenario?

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