但不是在标记为答案的帖子中，而是评分最高的帖子。Use multiple conflict_target in ON CONFLICT clause...
data_len; int hoff; bool hasnull = false; int numberOfAttributes = tupleDescriptor->natts; int i; if (numberOfAttributes > MaxTupleAttributeNumber) ereport(ERROR, (errcode(ERRCODE_TOO_MANY_COLUMNS), errmsg
qry->returningList =transformReturningList(pstate, stmt->returningList);/* Now we are done with SELECT-like processing, and can get on with * transforming the target list to match the UPDATE target columns.*/qry->targetList =transformUpdateTargetList(pstate, stmt->targetList);// 处理SQL语句...
Clauses(clause.OnConflict{ Columns: []clause.Column{{Name: "hash_key"}, {Name: "sort_key"}}, TargetWhere: clause.Where{Exprs: []clause.Expression{clause.Eq{Column: "tombstone", Value: false}}}, DoUpdates: clause.AssignmentColumns([]string{"value"}), }). Create(&metadataModel) if ...
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);...
pg_stats: statistics for range type columns Planner: exclusion of unnecessary table self-joins Planner: materialized CTE statistics Planner: accessing a table with multiple clauses Index range scan optimization dblink, postgres_fdw: detailed wait events Logical replication: migration of replication slots...
For example, if you have multiple columns in several tables that should be an between 0 and 255, you could use a custom data type so that you only have to define the constraints once. Or, if you have complex data - like metadata about a file - and you want to save it to a ...
conflictTarget: 'userId', // (required) look for conflicts on userId, use array for multiple conflict lookup columns excludeOnConflict: 'created', // don't overwrite created timestamp when you update, use array for multiple rows excluded ...
SET STORAGE external — Is rejected if the column is one of the columns of the replica identity for the table. RENAME — Can't rename an Autopartitioned table. SET SCHEMA — Can't set the schema of an Autopartitioned table. ALTER COLUMN ... TYPE — Changing a column's type isn't ...