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Added readme file for MySQL supported DDL.
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Kanthi 2023-08-09 17:15:58 -04:00 committed by GitHub
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#### DDL Supported (MySQL):
With Datatype conversion(From MySQL to ClickHouse)
ALTER TABLE
| MySQL | ClickHouse |
|--------------------------------------------------------|-----------------------------------------------------------------|
| ADD COLUMN | |
| ADD COLUMN NULL/NOT NULL | |
| ADD COLUMN DEFAULT | |
| ADD COLUMN FIRST, AFTER | |
| DROP COLUMN | |
| MODIFY COLUMN data_type | |
| MODIFY COLUMN data_type NULL/NOT NULL | |
| MODIFY COLUMN data_type DEFAULT | |
| MODIFY COLUMN FIRST, AFTER | |
| MODIFY COLUMN old_name new_name datatype NULL/NOT NULL | |
| RENAME COLUMN col1 to col2 | |
| CHANGE COLUMN FIRST, AFTER | MODIFY COLUMN |
| ALTER COLUMN col_name ADD DEFAULT | Not supported by grammar |
| ALTER COLUMN col_name ADD DROP DEFAULT | Not supported by grammar |
| ADD PRIMARY KEY | Cannot modify primary key in CH |
## TABLE operations
| MySQL | ClickHouse |
|------------------------------------------|-------------------------------------|
| RENAME TABLE name_1 to name_2 | |
| TRUNCATE TABLE | |
| DROP TABLE name_1 | |
| DROP TABLE name_1, name_2 | |
| ALTER TABLE table_name to new_table_name | RENAME table_name to new_table_name |
| CREATE TABLE PARTITION BY KEY(col1) | PARTITION BY col1 |
| CREATE TABLE PARTITION BY RANGE(col1,col2, col3) | PARTITION BY col1, col2, col3|
## DATABASE operations
| MySQL | ClickHouse |
|-----------------|------------|
| CREATE DATABASE | |
| USE DATABASE | |
### Not supported:
| MySQL | ClickHouse |
|--------------------------------------------------------|-----------------------------------------------------------------|
| ADD INDEX | Secondary indexes in CH, what about type and index granularity? |
| ADD CONSTRAINT (CHECK) | |
| ADD CONSTRAINT | Add constraint with Primary key(Not supported) |
| DROP CONSTRAINT | Add constraint with Primary key(Not supported) |