alter table add column
ALTER TABLE table
ADD COLUMN column VARCHAR (255) NOT NULL AFTER column;alter table add column
ALTER TABLE table
ADD COLUMN column VARCHAR (255) NOT NULL AFTER column;mysql update add to existing value
mysql> UPDATE tableName SET sometotal = sometotal+10 WHERE Id = 4;alter table mysql
ALTER TABLE contacts
ADD last_name varchar(40) NOT NULL
AFTER contact_id,
ADD first_name varchar(35) NULL
AFTER last_name;update table mysql
-- Things in brackets are optional
-- IGNORE modifier updates rows even if errors occur (ie: the rows that cause errors are simply not updated)
UPDATE [IGNORE] table_name
SET
column_name1 = expr1,
column_name2 = expr2,
...
[WHERE
condition]; -- WHERE tells us which rows to update based on said conditionchange column in mysql
#Alter is used
#alter table TableName change CurrentColumnName NewColumnName Specification(size);
alter table TableName change name firstname varchar(30);update column mysql with alter
ALTER TABLE table_name
MODIFY column_name column_definition
[ FIRST | AFTER column_name ];Copyright © 2021 Codeinu
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