1、增加一列
@H_301_13@ALTER TABLE table_name ADD column_name datatype;
@H_301_13@ALTER TABLE table_name DROP column_name;
@H_301_13@3、更改列的数据类型
@H_301_13@ALTER TABLE table_name ALTER column_name TYPE datatype;
@H_301_13@ALTER TABLE table_name RENAME TO new_name;
@H_301_13@5、更改列的名字
@H_301_13@ALTER TABLE table_name RENAME column_name to new_column_name;
@H_301_13@6、字段的not null设置
@H_301_13@ALTER TABLE table_name ALTER column_name {SET|DROP} NOT NULL;
@H_301_13@ALTER TABLE table_name ALTER column_name SET DEFAULT expression;
ALTER TABLE "crm_customer_call" alter COLUMN "tenant_id" DROP DEFAULT; ALTER TABLE "crm_customer_call" ADD CONSTRAINT MyUniqueConstraint UNIQUE(cti_call_id);
