CREATE TABLE orders ( order_id integer PRIMARY KEY, product_no integer REFERENCES products, quantity integer ); # 定义多个 Column 组成的外键,要求被约束列(外键)的数量和类型应该匹配被引用列(主键)的数量和类型。 CREATE TABLE t1 ( a integer PRIMARY KEY, b integer, c integer, FOREIGN KEY (b, ...
Table "public.tbl_check" Column | Type | Modifiers ---+---+--- a | integer | not null b | character varying(12) | not null Check constraints: "ck_tbl_check_a" CHECK (a > 0) "ck_tbl_check_b" CHECK (b::text = ANY (ARRAY['ab'::character varying, 'aB'::character varying...
TABLE "tbl1" CONSTRAINT "tbl1_id_fkey" FOREIGN KEY (id) REFERENCES tbl(id) postgres=# \d tbl1 Table "public.tbl1" Column | Type | Modifiers ---+---+--- id | integer | info | text | Foreign-key constraints: "tbl1_id_fkey" FOREIGN KEY (id) REFERENCES tbl(id) ...
test=# alter table tbl_null alter COLUMN b set not null; ERROR: column "b" contains null values test=# delete from tbl_null where b is null; DELETE 1 test=# alter table tbl_null alter COLUMN b set not null; ALTER TABLE test=# \d tbl_null Table "public.tbl_null" Column | Type...
{ "fdw_column_name_not_found", ERRCODE_FDW_COLUMN_NAME_NOT_FOUND }, { "fdw_dynamic_parameter_value_needed", ERRCODE_FDW_DYNAMIC_PARAMETER_VALUE_NEEDED }, { "fdw_function_sequence_error", ERRCODE_FDW_FUNCTION_SEQUENCE_ERROR }, { "fdw_inconsistent_descriptor_information", ERRCODE_FDW_...
Class HV — Foreign Data Wrapper Error (SQL/MED) HV000 fdw_error HV005 fdw_column_name_not_found HV002 fdw_dynamic_parameter_value_needed HV010 fdw_function_sequence_error HV021 fdw_inconsistent_descriptor_information HV024 fdw_invalid_attribute_value HV007 fdw_invalid_column_name HV008 fdw_...
表41. Class HV — Foreign Data Wrapper Error (SQL/MED) Error Code Condition Name HV000 fdw_error HV005 fdw_column_name_not_found HV002 fdw_dynamic_parameter_value_needed HV010 fdw_function_sequence_error HV021 fdw_inconsistent_descriptor_information HV024 fdw_invalid_attribute_value HV007 fdw...
create table t_key_event_file_student_102 (like t_key_event_file_student INCLUDING DEFAULTS); 接下来看一下DDL语句: 没错,与官方的说法一致,由于序列是指定在了列定义(column definitions )上,所以当使用了INCLUDING DEFAULTS时它自然会被复制,但这与我们的需求不符,因为我们的需求是每张被复制的表都应创建...
column_to_column_name 将partkey的pg_dist_partition列转换为文本列名称。 该转换可用于确定分布式表的分布列。 有关更详细的讨论,请参阅“选择分布列”。 参数 table_name:分布式表。 column_var_text:表中partkey的值。 返回值 table_name的分布列名称。
comment on column t_key_event_file_student.file_name is '附件文件名称'; comment on column t_key_event_file_student.file_path is '附件文件路径'; alter table t_key_event_file_student add constraint FK_T_KEY_EV_REF16_T_KEY_EV foreign key (key_event_score_student_id) ...