Alter table add column if not exists in MySql ; EXISTS · SELECT * ; FROM · WHERE · = ; 'user' AND · = ; 'table_schema' AND · = ; 'username3' · THEN ALTER ... ... <看更多>

390 views Premiered Apr 4, 2022 Add and Delete/Drop columns in SQL Server table / MySql Alter or Change DataType of a Column in SQL ... ... <看更多>

MySQL ALTER TABLE does not have IF EXISTS specification. You can do the following through using a stored proc or a programming language if this is something ... ... <看更多>

mysql --version mysql Ver 15.1 Distrib 10.3.23-MariaDB, ... ALTER TABLE example.example_table_5 MODIFY COLUMN IF EXISTS `col_1` CHAR(1) ... ... <看更多>