则向上插入事实上，在这里找到了它，但不是在标记为答案的帖子中，而是评分最高的帖子。Use multiple ...
* OnConflictExpr is deferred to createplan.c, as is collection of FDW data. */typedefstructModifyTablePath{ Path path;// 可以看到ModifyTablePath继承自PathCmdType operation;/* INSERT, UPDATE, or DELETE */boolcanSetTag;/* do we set the command tag/es_processed? */Index nominalRelation;/*...
INSERT INTO sample VALUES (1, repeat('a', 200), 10); SET bdr.ddl_replication TO FALSE; ALTER TABLE sample ALTER COLUMN col2 TYPE VARCHAR(128); INFO: in rewrite ERROR: value too long for type character varying(128) If underlying table data meets the characteristics of the new type, th...
DELETE and TRUNCATE operations from the source node to other nodes. Only the final changes are sent, after all triggers and rules are processed. For example,INSERT ... ON CONFLICT UPDATEsends either an insert or an update depending on what occurred on the origin. If an update or delete af...
Other features to work on may also include DDL replication feature and node management APIs to be made available. This is an exciting space and I hope in the future releases, we will move towards this direction. Improvements to SQL Partitioning Support identity columns in partitioned tables ...
I have n number of items. I would like to add them all with a single insert query. insert into testtable(id,name) values (1,"jack"),(2,"john"),(3,"jill"); I have an array for my rows, and I like to add them all in. So, if I provide pg th...
create unique index i on t(a) where t.b is null; insert into t (a, b) values ( 1, 1 ) on conflict (a) where t.b is null -- Error here do update set c = 1 returning t.a, t.b, t.c; drop table t; --- There's an error reported: SQL Error [42P01]: ERROR: inval...
For multiple columns, consider a multicolumn index.CREATE INDEX ON items (location_id, category_id);Exact indexes work well for conditions that match a low percentage of rows. Otherwise, approximate indexes can work better.CREATE INDEX ON items USING hnsw (embedding vector_l2_ops);...
You can also use ON CONFLICT to update existing aggregates while also inserting new ones. The MERGE command is a more advanced version of INSERT..SELECT that can also DELETE. For instance, let’s say I have a stock table that keeps track of how many items I have left. CREATE TABLE ...
INSERTINTOtest_valuesVALUES (1,25); SELECT*FROMadd_one()INTOactual; expected := 26; SELECTvalueFROMtest_valuesWHEREid=1INTOactual; SELECT*FROMassert.is_equal(actual, expected)INTOmessage,result; TRUNCATETABLEtest_values; -- Check if test failed ...