例:select prd_no,max(qty)from sales group by prd_no4.MIN返回指定数据的最小值。 例:select prd_no,min(qty)from sales group by prd_no5.SUM返回指定数据的和,只能用于数字列,空值被忽略。 例:select prd_no,sum(qty)from sales group by prd_no6.COUNT_BIG返回指定组中的项目数量,与COUNT函数不...
string str = HttpUtils.PostWebReq(@"http://157.45.47.1:6666/service/psntrn", JsonConvert.SerializeObject(a)); string splitStr = str.Replace(@"\\\", ""); return JsonConvert.SerializeObject(splitStr); } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. GET方式发送请求...
Convert string to the database encoding / dest_encoding.CONVERT_FROM ('TEXT', 'UTF8') = 'Text' CONVERT_TO ('Text', 'UTF8') = 'Text' Encode / Decode binary data into or from textual representation in a string. ENCODE (E'1234', 'base64') = 'MTIzNA==' DECODE ('MTIZAAE=', ...
convert(string using conversion_name) text 使用指定的转换名字改变编码。 convert('PostgreSQL' using iso_8859_1_to_utf8) 'PostgreSQL' lower(string) text 把字串转化为小写 lower('TOM') tom octet_length(string) int 字串中的字节数 octet_length('jose') 4 overlay(string plac...
语法命令 1. 基础语法 创建数据库 create database testdb; 删除数据库 postgres=# drop database testdb; DROP DATABASE postgres=# 创建表 创建表之前要连接指定的数据库 \c test; CREATE TABLE ta
3.6.23 2024-11-13 #48482 Convert large integer typed using NUMERIC(X, 0) into a BigInteger. l 3.6.22 2024-10-02 46900 Fixed a bug where source docs won't render on Airbyte 1.1 3.6.21 2024-10-02 46322 Support CDC against a read-replica (continuation) ...
按照路径将文件名和路径分割开 一、函数说明 1、split()函数 语法：str.split(str="",num=string....
(query_string=<optimized out>) at postgres.c:1685 #13 0x0000000000b9f8cc in PostgresMain (argc=<optimized out>, argv=argv@entry=0x18f0a50, dbname=<optimized out>, username=<optimized out>) at postgres.c:7181 #14 0x0000000000a7cec4 in BackendRun (port=0x18ee5e0) at postmaster.c:...
Whenever you need to split a text into multiple records breaking by some delimeter, there are two common options that PostgreSQL provides. The first isregpexp_split_to_tableand then next popular is using the unnest function in combination withstring_to_array. ...
AES加密机制： 密码学中的高级加密标准（Advanced Encryption Standard，AES），又称Rijndael加密法，是...