Within this tutorial, you will learn how to retrieve and analyze data from the Ethereum Blockchain with the help of the anyblock.tools SQL interface.
We will show you how to retrieve data from anyblock.tools using common SQL language.
What you must know already
This tutorial is written for programmers, who have some experience with SQL. You should also have visited the authorization page and set up our connection to the database. Remember that the subentities are stored using the Postgresql-Type JSONB. For more information on that, please take a look at the ER model.
Basic anyblock.tools SQL queries
Choose one of the databases available. All of them are encoded as the triple of:
The main chain is named ethereum_ethereum_mainnet.
After choosing a blockchain, you might continue with the example queries.
Find the latest block
SELECT * FROM block ORDER BY number DESC LIMIT 1
This will show the whole block. But you can use a shorter form:
SELECT max(number) FROM block
Find events for a given block
SELECT * FROM event
Find calls for a transaction hash
SELECT * FROM call
WHERE call.hash = '0xadd837afa5b68987eb9f0167ad65cbb8131f57da84db56a19acf4a5a98bd35da'
Find transactions for a given contract
For our example we use the address of the TenXPay token contract:
SELECT * FROM tx
Find specific events for a given contract
For our example we use the address of the TenXPay token contract again, however, we would like to know the values of transfers greater than 1ETH:
SELECT arg->'scaled', arg->'num'
FROM "event",jsonb_array_elements(args) arg
WHERE event = 'Transfer' AND address = '0xB97048628DB6B661D4C2aA833e95Dbe1A905B280'
AND (arg->'num')::numeric > 1000000000000000000
Find the latest 10 DAI Transfer events and extract sender, receiver, and value from JSON
args->0->>'hex' as "from",
args->1->>'hex' as "to",
CAST(args->2->'scaled' AS NUMERIC) AS "value"
WHERE address = '0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359'
AND event = 'Transfer'
ORDER BY timestamp DESC
Where to go from here
You may continue by taking a look at the Elasticsearch tutorial. Please let us know if you have any further questions or need some help with your application.
Interested or questions?
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Originally published at https://www.anyblockanalytics.com on August 13, 2020.