Database

Database is a systematic collection of data. Databases support storage and manipulation of data. Database makes easier to find data. For example.. 1. An online telephone directory would definitely use database to store data pertaining to people, phone numbers, other contact details, etc. 2. Library management system, each and every book are arranged according to particular subject or stream wise. Database in terms or computer science called Database Management System(DBMS) Some examples or DBMS MySQl, MS SQL, EXCEL, Oracle etc..

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A : see here. UPDATE tableName SET tag = LOWER(tag); fully workable; see also; <a href="https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_lower">https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_lower</a>
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A : here is the code for remove first character from string of column data; UPDATE table1 SET column1 = SUBSTRING_INDEX(column1 , "-",-1);
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A : hi here is code for this UPDATE `t1` SET `col1` = REPLACE(`col1`, ' ', '')
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A : short answer for this query UPDATE table1 set col1 = col2;
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A : hi here is code INSERT INTO t2 (col1) SELECT col1 FROM t1; INSERT INTO t2 (col2) SELECT col2 FROM t1;
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