How to write a SQL to replace strings in a column in a MySQL database table?

How to replace strings in a column in a MySQL database table? For example, I would like to replace with in a content column of a table post. You may use a SQL statement as follows. update post set content = replace(content, ‘’, ‘’) where content like ‘%’ Answered by Eric Z Ma.

What are the DDL and DML of Shark (Spark SQL)?

Currently, I wanna take Shark’s (Spark SQL) DDL and DML as an reference to design/implement SQLE’s DDL and DML. However, I cannot find its DDL and DML. I can only find several SQLs in Shark paper[1]. [1] shark paper – Shark’s language is Hive QL. HQL’s DDL and DML can be found at Hive […]

How to repair a MySQL table?

After a server crash and restarting, MyBB reports a SQL Error as follows: MyBB SQL Error MyBB has experienced an internal SQL error and cannot continue. SQL Error: 145 – Table ‘./mybb/mybb_sessions’ is marked as crashed and should be repaired Query: SELECT * FROM mybb_sessions WHERE sid=’40021925bd0494ea31…’ AND ip=’x.x.x.x’ LIMIT 1 The dababase is MySQL. […]

SQL layers on NoSQL databases

What are the SQL layer solution over NoSQL databases such as key/value stores? Phoenix: A SQL layer on HBase: They also show some performance results: Answered by anonymous. F1 – The Fault-Tolerant Distributed RDBMS Supporting Google’s Ad Business: With F1, we have built a novel hybrid system that combines the scalability, fault […]