substring(level_code,0,20)
时间: 2024-04-10 20:27:01 浏览: 20
您好,您想要对字符串 "level_code" 进行截取操作,保留其从索引 0 到 19 的子串,即取出前 20 个字符。以下是示例代码:
```python
level_code = "your_level_code_here"
substring = level_code[0:20]
print(substring)
```
请将 "your_level_code_here" 替换为实际的 level_code 变量值,并运行代码即可获得结果。
相关问题
SELECT cbdl_code, CASE WHEN LENGTH(cbdl_code) = 1 THEN name WHEN LENGTH(cbdl_code) = 3 THEN CONCAT_WS('/', (SELECT name FROM pms_cbdl WHERE cbdl_code = SUBSTRING(t1.cbdl_code, 1, 1)), (SELECT name FROM pms_cbdl WHERE cbdl_code = t1.cbdl_code)) WHEN LENGTH(cbdl_code) = 4 THEN CONCAT_WS('/', (SELECT name FROM pms_cbdl WHERE cbdl_code = SUBSTRING(t1.cbdl_code, 1, 1)), (SELECT name FROM pms_cbdl WHERE cbdl_code = SUBSTRING(t1.cbdl_code, 1, 3)), (SELECT name FROM pms_cbdl WHERE cbdl_code = t1.cbdl_code)) WHEN LENGTH(cbdl_code) = 5 THEN CONCAT_WS('/', (SELECT name FROM pms_cbdl WHERE cbdl_code = SUBSTRING(t1.cbdl_code, 1, 1)), (SELECT name FROM pms_cbdl WHERE cbdl_code = SUBSTRING(t1.cbdl_code, 1, 3)), (SELECT name FROM pms_cbdl WHERE cbdl_code = SUBSTRING(t1.cbdl_code, 1, 4)), (SELECT name FROM pms_cbdl WHERE cbdl_code = t1.cbdl_code)) END AS new_name FROM pms_cbdl t1;以上语句执行报错
您好!根据您提供的SQL语句 SELECT cbdl_code, CASE WHEN LENGTH(cbdl_code) = 1 THEN name WHEN LENGTH(cbdl_code) = 3 THEN CONCAT_WS('/', (SELECT name FROM pms_cbdl WHERE cbdl_code = SUBSTRING(t1.cbdl_code, 1, 1)), (SELECT name FROM pms_cbdl WHERE cbdl_code = t1.cbdl_code)) WHEN LENGTH(cbdl_code) = 4 THEN CONCAT_WS('/', (SELECT name FROM pms_cbdl WHERE cbdl_code = SUBSTRING(t1.cbdl_code, 1, 1)), (SELECT name FROM pms_cbdl WHERE cbdl_code = SUBSTRING(t1.cbdl_code, 1, 3)), (SELECT name FROM pms_cbdl WHERE cbdl_code = t1.cbdl_code)) WHEN LENGTH(cbdl_code) = 5 THEN CONCAT_WS('/', (SELECT name FROM pms_cbdl WHERE cbdl_code = SUBSTRING(t1.cbdl_code, 1, 1)), (SELECT name FROM pms_cbdl WHERE cbdl_code = SUBSTRING(t1.cbdl_code, 1, 3)), (SELECT name FROM pms_cbdl WHERE cbdl_code = SUBSTRING(t1.cbdl_code, 1, 4)), (SELECT name FROM pms_cbdl WHERE cbdl_code = t1.cbdl_code)) END AS new_name FROM pms_cbdl t1; ,由于缺少表结构和完整的错误信息,无法准确判断报错原因。
请提供完整的错误信息,以及相关的表结构和数据,这样我才能更好地帮助您解决问题。谢谢!
diag_code.substring(0,diag_code.length()-1);举例输出这段代码
假设当前的 diag_code 为 "ABCDEF",那么运行这段代码会输出字符串 "ABCDE",即去掉了字符串的最后一个字符 "F"。具体的代码实现如下:
```
String diag_code = "ABCDEF";
diag_code = diag_code.substring(0, diag_code.length() - 1);
System.out.println(diag_code); // 输出 "ABCDE"
```
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