加不加效果完全一样，这是从其它数据库系统引用进来的，给这个PKEY约束功能增加一个名字而已，其它数据库可以依此操作相应的约束（启用、停用、删除、改名等）。
pkey = constraint;break; } }switch(action) {case"select":assert(defaultProc.getSinglepartition());returngenerateCrudSelect(table, partitionColumn, pkey);case"insert":if(defaultProc.getSinglepartition()) {returngenerateCrudInsert(table, partitionColumn); }else{returngenerateCrudReplicatedInsert(table); }ca...
Use sensible constraint names, such as customer_pkey, which will mean so much more than SYS_C001136. Likewise, before data is loaded, the constraints can be quickly disabled using the DISABLE clause, as shown in the following code segment: Sign in to download full-size image The ETL stage...
When a user has created a new mailbox and wants to log in for the first time, this error can be seen in the log: DB Error: [7] ERROR: duplicate key value violates unique constraint "users_pkey" DETAIL: Key (user_id)=(59) already exists. ...
29507:20140120:105108.926 NODE 999: received events from node 266 for node 266 datalen 648252 29502:20140120:105109.648[Z3005]query failed:[0]PGRES_FATAL_ERROR:ERROR: duplicate key value violates unique constraint "events_pkey" DETAIL: Key (eventid)=(26326300001400713) already exists. ...
Only the PKEY_WNET_DisplayType and PKEY_WNET_Comment property keys are populated from theNETRESOURCEstructure supplied by the NetBIOS provider. WNET_CONSTRAINTVALUE_TYPE_ALL L"All" Query all resources discoverable by the NetBIOS provider.
pq: duplicate key value violates unique constraint "tablename_pkey" 原因 PostgreSQLではprimary key(column_name:id)にSERIAL型を指定したとき、シーケンスが自動生成される。シーケンスはcolumnのデフォルト値に連番を割り当てる。(MySQLのAUTO_INCREMENTよろしく) ...
First reported in #843 (comment) Very occasionally (at least once), we see a test failure ActiveRecord::RecordNotUnique: PG::UniqueViolation: ERROR: duplicate key value violates unique constraint "users_pkey". This is a Postgres error bu...
DROP CONSTRAINT BLOB_TRIGGERS_PKEY;ALTER BLOB_TRIGGERS删除主键; ALTER BLOB_TRIGGERS删除索引“主 浏览4提问于2012-02-11得票数 4 回答已采纳 2回答 无法在MySql中删除外键列 acct_doc_item_data`ADD FOREIGN KEY (fk_job_id) REFERENCES `job`(`job_id`); 现在我想删除这个专栏第二个Alter语句给出...
ordersTable.Constraints.Add( "pKey", ordersTable.Columns["CustID"], true); // Remove constraints. customersTable.Constraints.RemoveAt(0); // Results in an Exception. You can't remove // a primary key constraint. ordersTable.Constraints.RemoveAt(0); } catch(Exception ex) { // Process exc...