如何更改 SQL 格式答案

【问题标题】：How to change SQL format如何更改 SQL 格式
【发布时间】：2021-12-31 18:20:35
【问题描述】：

我有一个这样的 SQL 查询

return $this->db->query("SELECT * FROM `rincian_permintaan` 
    JOIN `permintaan` ON `permintaan`.`id_permintaan` = `rincian_permintaan`.`id_permintaan` 
    JOIN `users` ON `permintaan`.`id_peminta` = `users`.`user_id` 
    JOIN `cabang` ON `cabang`.`id_cabang` = `users`.`id_cabang` 
    JOIN `barang` ON `barang`.`id_barang` = `rincian_permintaan`.`id_barang` 
    JOIN `po` ON `rincian_permintaan`.`id_po` = `po`.`id_po` WHERE `po`.`id_cabang` = '201' AND `users`.`id_cabang` != 201 AND 
    NOT EXISTS(SELECT * FROM airwaybill WHERE airwaybill.id_rincian_permintaan = rincian_permintaan.id_rincian_permintaan)
    ORDER BY rincian_permintaan.created_at DESC")->result_array();

我想把格式改成：

$this->db->select('*');
$this->db->from('tableName');
$this->db->join('...');
$this->db->where('...');

这是我尝试过的：

$this->db->select('*');
$this->db->from('rincian_permintaan');
$this->db->join('permintaan', 'permintaan.id_permintaan = rincian_permintaan.id_permintaan');
$this->db->join('users', 'permintaan.id_peminta = users.user_id');
$this->db->join('cabang', 'cabang.id_cabang = users.id_cabang');
$this->db->join('barang', 'barang.id_barang = rincian_permintaan.id_barang');
$this->db->join('po', 'rincian_permintaan.id_po = po.id_po');
$this->db->where('po.id_cabang', '201');
$this->db->where('users.id_cabang != 201');

$this->db->select('*');
$this->db->from('airwaybill');
$this->db->where('NOT EXISTS airwaybill.id_rincian_permintaan = rincian_permintaan.id_rincian_permintaan', '', FALSE);
return $this->db->get('rincian_permintaan')->result_array();

错误：

【问题讨论】：

如果您检查第一个查询，则您在 NOT EXISTS 中有子查询，而在 CI 查询生成器中，它不是子查询复制相同的子查询在哪里可以工作。

标签： php mysql codeigniter web

【解决方案1】：

你只需要为子查询生成sql字符串而不执行它，并在外部查询中使用它并产生结果。

$this->db->select('*');
$this->db->from('airwaybill');
$this->db->where('airwaybill.id_rincian_permintaan = rincian_permintaan.id_rincian_permintaan');
$sub_query = $this->db->get_compiled_select();

$this->db->select('*');
$this->db->from('rincian_permintaan');
$this->db->join('permintaan', 'permintaan.id_permintaan = rincian_permintaan.id_permintaan');
$this->db->join('users', 'permintaan.id_peminta = users.user_id');
$this->db->join('cabang', 'cabang.id_cabang = users.id_cabang');
$this->db->join('barang', 'barang.id_barang = rincian_permintaan.id_barang');
$this->db->join('po', 'rincian_permintaan.id_po = po.id_po');
$this->db->where('po.id_cabang', '201');
$this->db->where('users.id_cabang != 201 ');
$this->db->where('NOT EXISTS('.$sub_query.')');

$query = $this->db->get();
$result = $query->result_array();
return $result;

【讨论】：