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Docker Error I encountered it when I tried to $ docker-compose up -d --build ERROR: for docker-compose_jupyternotebook_sql_adminer_1 Cannot start service adminer: driver failed programming external coCreating docker-compose_jupyternotebook_sql_db_1 ... error d1220a2d3): Bind for 0.0.0.0:8080 failed: port is already allocated Cause The port what I tried is already allocated to somewhere so it is ..

OSI 7 Layers Closer to the computer lower layer, closer to the human higher layer. TCP - Origin To prevent data loss, split the data into small pieces and send the data through multiple lines instead of communicate with only one physical line. reference : https://evan-moon.github.io/2019/11/10/header-of-tcp/ - Two way, exchanging response signals between sender and receiver. Sender : Sends the d..

Packet Packets are bundles of appropriate sizes when sending and receiving data. In other words, it is the unit of transmission of cut data to facilitate transmission over the network. For example, data is divided into packet units and transmitted to IP layer. - Data Encapsulation When sender sends data to the receiver, it is the process of putting header on the data. - Data Decapsulation When r..

1. Data extract - SQL SELECT * FROM history_dt LIMIT 5; - Pandas tips.head() 2. Filter data - SQL SELECT t1.STK_CD, t1.DT, t1.O_PRC FROM history_dt t1 WHERE STK_CD='000020' LIMIT 5; - Pandas tips.query("day=='Thur'").head() or tips.loc[tips['day']=='Thur'].head() or tips[tips['day']=='Thur'].head() 3. Sort data 1) - SQL SELECT t1.STK_CD, t1.DT, t1.O_PRC FROM history_dt t1 WHERE STK_CD='005930' O..

SQL Error db_1 | ERROR: Can't initialize batch_readline - may be the input source is a directory or a block device. sql_db_1 exited with code 1 Cause I changed the name of sql file. 😅 So it doesn't match with docker-compose file. Solution Put the sql file name back as before. And then docker-compose down, docker-compose up.