ArgumentError:未知键::唯一性。有效密钥是::class_name、:anonymous_class、:foreign_key、:Valid、:autosave、:table_name、:before_add、:after_add、:before_remove、:after_remove、:extend、:primary_key、:依赖性、:as、透、:source、:source_type、:inverse_of、:counter_cache、:join_table、:foreign_type、:index_errors
class League < Active
SQLSTATE42S22:找不到列: 1054“where子句”中的未知列“products.wishlist_id”(SQL: select * from products where products.wishlist_id =1 and products.wishlist_id is not null和products.deleted_at is null)
In my controller >>>
public function index() {
$wishlist_items = Wishlist::where('user_id', A
我可以知道include子句如何提高覆盖索引中的性能吗?
CREATE NONCLUSTERED INDEX includeIndex
ON mytable(COL1)
INCLUDE(COL2,COL3,COL3)
它们之间的区别是什么?
CREATE NONCLUSTERED INDEX includeIndex ON mytable(COL1) INCLUDE(COL2,COL3,COL3)
和
CREATE NONCLUSTERED INDEX nonincludeIndex ON mytable(COL1,COL2,COL3,COL3)
谢谢
SQLSTATE42S22:未找到列:'where子句‘中1054个未知列'notices.notice_category_id’(SQL: select * from notices where notices.notice_category_id =1和notices.notice_category_id为null,notices.deleted_at为null)
This is notices table migration
public function up()
{
Schema::create('notices', func
我正在从sql服务器迁移到postgres。在sql server中,我创建了如下所示的索引:
CREATE FULLTEXT INDEX ON [testdb].[dbo].['table'] (test1,test2...) KEY INDEX unique_index
WITH STOPLIST = SYSTEM
如何在postgres中创建相同的内容,如果我试图为这样的多列创建,则会产生错误:
CREATE INDEX ON [testdb].[dbo].['table'] USING gin (to_tsvector(
我的键是组合键
public struct Mykey{
public int index;
public string known1;
public string known2;
}
我想通过known1和known2获取带有最大索引的键,我的代码如下
Dictionary<key, value> dict = new Dictionary<key, value>();
// below O(n) operation
dict.Where( k => (k.Key.known1 =="str1") &
是否有方法在多列聚集索引上创建全文索引?
CREATE UNIQUE CLUSTERED INDEX idx_ContactsView
ON ContactsView (ContactId,CeId,CpId);
GO
CREATE FULLTEXT INDEX ON dbo.ContactsView
(Name,Email,PhoneNumber) KEY INDEX idx_ContactsView
ON ContactsCatalog;
ALTER FULLTEXT INDEX ON ContactsView SET STOPLIST = OFF
对于SQL-SER
我有两个这样的索引。
索引1:
CREATE NONCLUSTERED INDEX [index1]
ON [dbo].[table1] ([column1], [column2], [column3])
INCLUDE ([column4], [column5], [column6]) WITH (ONLINE = ON)
指数2:
CREATE NONCLUSTERED INDEX [index2]
ON [dbo].[table1] ([column2], [column1], [column3])
INCLUDE ([column4], [column5]) WITH (ONLI
我已经读了大约十亿遍了,但我不能理解……我在工作台中生成了这个,所以它应该可以工作,但它创建了除部分之外的所有表……如果我删除部门和讲师之间的关系,它将创建它,但我需要该关系才能工作……任何帮助都将不胜感激!代码如下...希望有人能帮助我!谢谢!
SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0;
SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='TRA
当用户单击链接时,我试图使用列SongID从数据库中获取特定数据,但我得到了以下错误:
SQLSTATE42S22:未找到列:'where子句‘中的1054个未知列'id’(SQL: select * from songs,其中id =5限制1)
主计长级:
<?php namespace App\Http\Controllers;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use DB;
class SongsContro
我正在关注"CQL3 for Cassandra experts“()的文章。正在执行中
CREATE TABLE playlists (
id uuid,
title text,
album text,
artist text,
song_id uuid,
PRIMARY KEY (id, title, album, artist)
);
工作正常。但是当你试图跑步的时候
CREATE INDEX ON playlists(artist);
我得到一个错误:
An error occurred when executing the SQL command:
C
我想知道在SQL server中,创建非聚集索引的这两条语句是否具有相同的行为?
create nonclustered index EmpLastname_Incl_Firstname
on employee(lastname) include (firstname);
create nonclustered index EmpLastnameFirstname
on employee(lastname, firstname)
我现在只是在玩Laravel,试图找出它是否是一个用于项目的框架的好选择。
我从下载了生成器包,并按照文档创建了一个资源。
这给了我一个有作者和身体的表格。
生成的存储方法如下所示:
/**
* Store a newly created resource in storage.
*
* @return Response
*/
public function store()
{
$input = Input::all();
$validation = Validator::make($input, Twee
我有两个型号 TermOne <?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class TermOne extends Model
{
public function term_one_files()
{
return $this->hasMany('App\TermOneFile');
}
} 我想要获取此模型的值 <?php
namespace App;
use Illuminate\Database\Eloquent\Model
我正在写一个脚本生成脚本。脚本正在生成DDL状态列表。
util_generator.sql生成从数据库连接开始:
USE [TARGET_DATABASE]
GO
...
Many queries
Followed by print statements
...
因为这是一个很长的脚本,长度未知。我们使用SQLCMD.exe
sqlcmd -s sa\password -i util_generator.sql -r0 -o util_1.sql
生成的脚本util_1.sql如下所示:
Changed database context to 'TARGET_DATABASE'
DROP SCHEMA IF EXISTS `YouthMinistry` ;
CREATE SCHEMA IF NOT EXISTS `YouthMinistry` DEFAULT CHARACTER SET utf16 COLLATE utf16_general_ci ;
USE `YouthMinistry` ;
-- -----------------------------------------------------
-- Table `YouthMinistry`.`group`
-- ---------------------------------------------