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Talend tHash components are great but fiddly

The tHash component in Talend is a really useful way of caching data in a flow for use in a lookup or for self-joins and loads of other useful things. However it has one fiddly draw back which is that

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Normalising Data with Talend tMap

The other day I got a particularly tricky set of data to transform. It consisted of a list of contracts each identifying an account and a list of contacts related to the contract and by implication the account. I needed

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