PostgreSQL group_concat function is unavailable, but we have used the same function as array_agg and array_to_string to work the same as the group_concat function in PostgreSQL. There is no function available in PostgreSQL of group_concat, but we have used array_agg and array_to_string to...
In PostgreSQL, you can concatenate strings to combine text values from one or more columns or add literal strings to column values. PostgreSQL offers multiple ways to perform string concatenation, including using the || operator, the CONCAT function, and CONCAT_WS for strings with separators. Stri...
字符函数名称 描述 CONCAT(字符串1,字符串2) 将字符串1和字符串2连接成一个新的字符串示例: select CONCAT(job,ename) from emp LPAD(字段,总的大小,添充字符) 左填充即向右对齐示例: select empno,lpad(sal,10,'*') from emp RPAD(字段,总的大小,添充字符) 右填充即向左对齐示例: select empno,rpad(...
|| CONCAT ---并置运算符。 格式∶CONCAT(STRING1, STRING2) 例:’ABC’|| ’DE’=’ABCDE’ CONCAT(‘ABC’,’DE’) =’ABCDE’ ASCII---返回字符的ASCII码。 例:ASCII(‘A’) = 65 CHR---返回指定ASCII码的字符。 例:CHR(65) = ‘A’ INSTR---搜索子串位置 格式∶INSTR(STRING , SET[ , ...
4、查询指定表的字典(表名、字段名、备注、类型) selectc.relnameas表名, obj_description(relfilenode,'pg_class')::varcharas表注释, d.descriptionas字段备注, a.attnameas字段名, concat_ws ('', t.typname,SUBSTRING(format_type (a.atttypid,a.atttypmod)from'\(.*\)'))as字段类型frompg_class...
Fixed behavior of CONCAT() and CONCAT_WS() functions for multibyte characters and to work with atleast 2 and 3 arguments respectively. Fixed an issue to allow ALTER COLUMN with type char for Temp Table. Fixed an issue in CONVERT function to make it work consistently with BINARY and VARBINARY...
"WHEN c.DATA_TYPE ='enum'THENLOWER(CONCAT(c.COLUMN_NAME,'_t'))" "WHEN c.DATA_TYPE ='tinyint'THEN'smallint'" "WHEN c.DATA_TYPE ='mediumint'THEN'integer'" "WHEN c.DATA_TYPE ='tinyint unsigned'THEN'smallint'" "WHEN c.DATA_TYPE ='smallint unsigned'THEN'integer'" ...
Converting indexes: SQL Server PostgreSQL 1 CREATE [UNIQUE] INDEX name ON tab Create an index CREATE [UNIQUE] INDEX name ON tab cols 2 (col [ASC | DESC], …) Index columns (col [ASC | DESC], …) 3 INCLUDE (ncol, … ) Non-key columns to include INCLUDE (ncol, … ) ...
concat(specificVersions)); // Check maximum length (adjust limit as needed) if (combinedVersions.length > MAX_VERSIONS_LENGTH) { throw new Error('Combined versions exceed maximum allowed length'); } data.specificVersions = combinedVersions; await model.update({ data }); } .github/workflows/...
concat、concat_ws和format函数是可变的,因此可以把要串接或格式化的值作为一个标记了VARIADIC关键字的数组进行传递(见Section 36.4.5)。数组的元素被当作函数的独立普通参数一样处理。如果可变数组参数为 NULL,concat和concat_ws返回 NULL,但format把 NULL 当作一个零元素数组。