数据仓库服务 GaussDB(DWS)-ALTER TABLE:表操作示例
表操作示例
重命名表:
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ALTER TABLE CUSTOMER RENAME TO CUSTOMER_t; |
给表增加一个新的约束:
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ALTER TABLE customer_address ADD PRIMARY KEY(ca_address_sk); |
根据已有唯一索引为表增加主键约束或唯一约束。
先给表CUSTOMER创建唯一索引CUSTOMER_constraint1,然后根据已有唯一索引增加主键约束,并对前面创建的索引rename:
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CREATE UNIQUE INDEX CUSTOMER_constraint1 ON CUSTOMER(C_CUSTKEY);ALTER TABLE CUSTOMER ADD CONSTRAINT CUSTOMER_constraint2 PRIMARY KEY USING INDEX CUSTOMER_constraint1; |
重命名表约束:
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ALTER TABLE CUSTOMER RENAME CONSTRAINT CUSTOMER_constraint2 TO CUSTOMER_constraint; |
删除表约束:
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ALTER TABLE CUSTOMER DROP CONSTRAINT CUSTOMER_constraint; |
给表增加一个索引:
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ALTER TABLE CUSTOMER ADD INDEX CUSTOMER_index(C_CUSTKEY); |
删除表索引:
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ALTER TABLE CUSTOMER DROP INDEX CUSTOMER_index;ALTER TABLE CUSTOMER DROP KEY CUSTOMER_index; |
向在一个列存表中添加局部聚簇列:
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ALTER TABLE customer_address ADD CONSTRAINT customer_address_cluster PARTIAL CLUSTER KEY(ca_address_sk); |
删除一个列存表中的局部聚簇列:
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ALTER TABLE customer_address DROP CONSTRAINT customer_address_cluster; |
切换列存表的存储格式:
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ALTER TABLE customer_address SET (COLVERSION = 1.0); |
修改表的分布方式:
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ALTER TABLE customer_address DISTRIBUTE BY REPLICATION; |
修改表模式:
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ALTER TABLE customer_address SET SCHEMA tpcds; |
单表冷热切换:
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ALTER TABLE cold_hot_table REFRESH STORAGE; |
列存分区表修改为冷热表:
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CREATE table test_1(id int,d_time date)WITH(ORIENTATION=COLUMN)DISTRIBUTE BY HASH (id)PARTITION BY RANGE (d_time)(PARTITION p1 START('2022-01-01') END('2022-01-31') EVERY(interval '1 day'))ALTER TABLE test_1 SET (storage_policy = 'LMT:100'); |
修改表缓存策略(仅存算分离3.0版本集群支持):
ALTER TABLE orders SET (cache_policy = 'NONE');
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