Update budget set entry_amount = ${budgetCount}, examine = ${examine} WHERE pj_id = ${pjId} and type = 4这段sql需要计算${budgetCount}的和怎么改写
时间: 2024-02-17 15:02:50 浏览: 19
可以使用SUM函数来计算${budgetCount}的和,改写后的SQL语句如下:
```
UPDATE budget SET entry_amount = (SELECT SUM(entry_amount) FROM budget WHERE pj_id = ${pjId} and type = 4), examine = ${examine} WHERE pj_id = ${pjId} and type = 4;
```
其中,SUM函数用于计算entry_amount的总和,将其作为entry_amount的值进行更新。同时,examine值也进行了更新。
相关问题
优化mySQL语句 SELECT * (SELECT DEPT_ID, FROM SPSYS_DEPARTMENT WHERE DEPT_ABBR = COST_CENTER AND RECORD_STATUS = '1') DEPT_ID, (SELECT DEPT_NAME FROM SPSYS_DEPARTMENT WHERE DEPT_ABBR = COST_CENTER AND RECORD_STATUS = '1') DEPT_NAME, (SELECT DEPT_NO FROM SPSYS_DEPARTMENT WHERE DEPT_ABBR = COST_CENTER AND RECORD_STATUS = '1') DEPT_NO, FROM BM_BUDGET_REC_EXEC_ORA_IMP WHERE CURRENCY = 'RMB'
这个 SQL 查询语句可以进行如下优化:
1. 使用 JOIN 代替子查询,可以提高查询效率:
```
SELECT b.DEPT_ID, d.DEPT_NAME, d.DEPT_NO
FROM BM_BUDGET_REC_EXEC_ORA_IMP b
LEFT JOIN SPSYS_DEPARTMENT d ON b.COST_CENTER = d.DEPT_ABBR
WHERE b.CURRENCY = 'RMB' AND d.RECORD_STATUS = '1';
```
2. 不要使用 SELECT *,只选择需要的列,可以减少查询时间和网络传输的数据量。
```
SELECT b.DEPT_ID, d.DEPT_NAME, d.DEPT_NO
FROM BM_BUDGET_REC_EXEC_ORA_IMP b
LEFT JOIN SPSYS_DEPARTMENT d ON b.COST_CENTER = d.DEPT_ABBR
WHERE b.CURRENCY = 'RMB' AND d.RECORD_STATUS = '1';
```
3. 对于经常查询的列,可以添加索引,以提高查询效率。
```
ALTER TABLE SPSYS_DEPARTMENT ADD INDEX idx_dept_abbr_record_status (DEPT_ABBR, RECORD_STATUS);
```
set @sql语句='select @项目ID= item_no from bm_dw.dbo.bm_item where 1= 1 and BUDGET_YEAR = '+cast(@年度 as varchar)+' and ITEM_ID='''+@项目编码+'''' execute sp_executesql @sql语句,N'@项目ID varchar(100) output',@临时使用的项目编码 output 翻译成mysql语句
在MySQL中,可以使用prepared statement来实现类似于SQL Server中的sp_executesql的功能。下面是将该查询语句转换为MySQL语法的代码示例:
```
SET @sql = CONCAT('SELECT item_no INTO @项目ID FROM bm_dw.bm_item WHERE 1=1 AND BUDGET_YEAR = ', CAST(@年度 AS CHAR), ' AND ITEM_ID = ''', @项目编码, '''');
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
```
需要注意的是,在MySQL中,使用prepared statement时需要使用CONCAT函数将字符串和变量拼接起来。同时,MySQL中也没有类似于sp_executesql的存储过程,因此需要使用PREPARE和EXECUTE语句来执行动态SQL语句。