SELECT * FROM aj_ktxx idx WHERE NOT EXISTS (SELECT 1 FROM aj_ktxx d2 ON d2.id = idx.id) 错误
时间: 2024-04-08 18:32:27 浏览: 12
你的查询语句中存在语法错误。在 EXISTS 子查询中,你需要在 ON 子句中指定关联条件,而不是使用等号来关联两个表。
下面是修正后的查询语句:
SELECT *
FROM aj_ktxx idx
WHERE NOT EXISTS (
SELECT 1
FROM aj_ktxx d2
WHERE d2.id = idx.id
)
这样,查询将返回在 `aj_ktxx` 表中存在但在 `d2` 表中不存在的记录。
相关问题
SELECT idx.ah, idx.ay, idx.lasj, idx.jasj, idx.bh_cqaj, idx.cqaj_ah, idx.ajzlb, idx.c_splcygk, idx.c_bh_sck AS ajbh, idx.ztm AS caseStatus FROM aj_index_2023 idx WHERE NOT EXISTS( SELECT 1 FROM aj_index_2023 d2 ON d2.id = idx.id ) 错误
抱歉,你提供的 SQL 查询语句存在错误。在子查询中,你需要为表 "d2" 提供别名,并且在 ON 子句中指定正确的条件来连接两个表。以下是修正后的查询语句:
```
SELECT
idx.ah,
idx.ay,
idx.lasj,
idx.jasj,
idx.bh_cqaj,
idx.cqaj_ah,
idx.ajzlb,
idx.c_splcygk,
idx.c_bh_sck AS ajbh,
idx.ztm AS caseStatus
FROM
aj_index_2023 idx
WHERE
NOT EXISTS (
SELECT
1
FROM
aj_index_2023 d2
WHERE
d2.id = idx.id
);
```
请注意,这个修正仅仅是为了解决语法错误,具体查询逻辑是否符合你的需求还需要根据你的具体业务需求来调整。
优化以下SQL使其查询速度更快SELECT P.LOT_NO UNIT_ID, '0' AS UNIT_TYPE, '宗地' AS UNIT_TYPE_DES, NVL(BD.PARCEL_CODE_TMP, P.LOT_NO || P.SITE) UNIT_CODE, P.PARCEL_NO, P.LOC_CANTON, BD.REAL_UNIT_NO AS UNIT_CODE_GB, P.LU_LOCATION, P.SITE_KEY, P.CHG_TYPE, P.LU_AREA AS UNIT_AREA, P.PARCEL_CODE FROM V_LD_PARCEL P LEFT JOIN V_BD_PARCEL BD ON BD.LOT_NO = P.LOT_NO where 2 > 1 and not exists (select 1 from v_bk_reg_idx idx where idx.reg_unit_code = p.lot_no and idx.reg_unit_type = '0' and idx.buss_reg_type = '1101' and (idx.status_book = '1' or idx.status_book = '9')) and not exists(select 1 from v_bk_reg_idx idx where (idx.reg_unit_code, idx.reg_unit_type) in (select rise_id, '1' from bd_rise br, bd_parcel bp where br.par_lot_no = bp.lot_no and bp.lot_no = p.lot_no) and idx.buss_reg_type = '1200') and p.parcel_no = ?
首先,可以看到这个SQL语句中有两个子查询。这些子查询可能会导致性能问题,因此可以尝试优化它们。
以下是可能的优化措施:
1. 将子查询转换为JOIN语句
将第一个子查询转换为JOIN语句,可以避免使用NOT EXISTS,从而提高性能。例如:
```
SELECT P.LOT_NO UNIT_ID,
'0' AS UNIT_TYPE,
'宗地' AS UNIT_TYPE_DES,
NVL(BD.PARCEL_CODE_TMP, P.LOT_NO || P.SITE) UNIT_CODE,
P.PARCEL_NO,
P.LOC_CANTON,
BD.REAL_UNIT_NO AS UNIT_CODE_GB,
P.LU_LOCATION,
P.SITE_KEY,
P.CHG_TYPE,
P.LU_AREA AS UNIT_AREA,
P.PARCEL_CODE
FROM V_LD_PARCEL P
LEFT JOIN V_BD_PARCEL BD ON BD.LOT_NO = P.LOT_NO
LEFT JOIN v_bk_reg_idx idx ON idx.reg_unit_code = p.lot_no
AND idx.reg_unit_type = '0'
AND idx.buss_reg_type = '1101'
AND (idx.status_book = '1' OR idx.status_book = '9')
WHERE 2 > 1
AND idx.reg_unit_code IS NULL
AND P.PARCEL_NO = ?
```
同样,将第二个子查询转换为JOIN语句也可以提高性能:
```
SELECT P.LOT_NO UNIT_ID,
'0' AS UNIT_TYPE,
'宗地' AS UNIT_TYPE_DES,
NVL(BD.PARCEL_CODE_TMP, P.LOT_NO || P.SITE) UNIT_CODE,
P.PARCEL_NO,
P.LOC_CANTON,
BD.REAL_UNIT_NO AS UNIT_CODE_GB,
P.LU_LOCATION,
P.SITE_KEY,
P.CHG_TYPE,
P.LU_AREA AS UNIT_AREA,
P.PARCEL_CODE
FROM V_LD_PARCEL P
LEFT JOIN V_BD_PARCEL BD ON BD.LOT_NO = P.LOT_NO
LEFT JOIN v_bk_reg_idx idx ON idx.reg_unit_code = p.lot_no
AND idx.reg_unit_type = '0'
AND idx.buss_reg_type = '1101'
AND (idx.status_book = '1' OR idx.status_book = '9')
LEFT JOIN v_bk_reg_idx idx2 ON idx2.reg_unit_code = (SELECT rise_id FROM bd_rise br, bd_parcel bp WHERE br.par_lot_no = bp.lot_no AND bp.lot_no = p.lot_no)
AND idx2.reg_unit_type = '1'
AND idx2.buss_reg_type = '1200'
WHERE 2 > 1
AND idx.reg_unit_code IS NULL
AND idx2.reg_unit_code IS NULL
AND P.PARCEL_NO = ?
```
2. 添加索引
为V_LD_PARCEL和V_BD_PARCEL表添加适当的索引,可以加速JOIN操作。例如:
```
CREATE INDEX idx_v_ld_parcel_parcel_no ON V_LD_PARCEL (PARCEL_NO);
CREATE INDEX idx_v_bd_parcel_lot_no ON V_BD_PARCEL (LOT_NO);
```
3. 减少查询返回的行数
如果查询返回的行数非常大,可以考虑分页或者限制返回的行数。这可以减少查询的执行时间。例如,可以添加以下子句来限制返回的行数:
```
WHERE ROWNUM <= 100
```