如果你的HTML总是有效的XHTML，那么你应该使用XML函数来解析字符串：
SELECTSUBSTR( first_name,1,1) initials ,COUNT( * )FROMemployeesGROUPBYSUBSTR( first_name,1,1)ORDERBYinitials;Code language:SQL (Structured Query Language)(sql) In this tutorial, you have learned how to use the OracleSUBSTR()function to extract a substring from a string....
create or replace function getclob( table_name in varchar2, field_id in varchar2, field_name in varchar2, v_id in number, v_pos in number) return varchar2 is lobloc clob; buffer varchar2(32767); amount number := 2000; offset number := 1; query_str varchar2(1000); begin query_st...
The Oracle/PLSQL REGEXP_SUBSTR function is an extension of the SUBSTR function. This function, introduced in Oracle 10g, will allow you to extract a substring from a string using regular expression pattern matching.Syntax The syntax for the REGEXP_SUBSTR function in Oracle is: REGEXP_SUBSTR(...
3 Oracle SQL : Regexp_substr 2 Regular Expression for REGEXP_SUBSTR in Oracle 0 Regexp_substr expression 0 Oracle Query on Regexp_substr 0 regexp_substr for getting correct result 1 Oracle SQL Regular Expression (regexp_substr) 0 Regular Expression 0 Oracle SQL regexp_substr 0...
This gives me the ORA-01489: result of string concatenation is too long error probably because the SQL_TEXT column in my query above exceeds 4000 characters. Please suggest a way around. Thanks. sql oracle-database askedMay 17, 2017 at 16:00 ...
unfortunately, we are on python 3.11 and cx-Oracle won't run. But its reproducible at the db level from the generated query: Connected to: Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production Version 19.17.0.0.0 SQL> SELECT "CLOBBUGAPP_MYTILE"."ID", "CLOBBUGAPP_MYTI...
If you are porting a regular expression query from an Oracle database, remember that Oracle considers a zero-length string to be equivalent to NULL, while Vertica does not.Syntax REGEXP_SUBSTR( string, pattern [, position[, occurrence[, regexp‑modifier[, captured‑subexp ]]… ]] ) Pa...
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To define a hierarchical relationship in a query, you must use the CONNECT BY clause. 所以关于connect by,你可以先往后看。 使用LEVEL后的效果: LEVEL是一个在CONNECT BY子句中使用的伪列,它代表当前递归层次的级别。在每次递归调用中,LEVEL的值会增加1。在这个例子中,LEVEL的值会从1开始,一直到tech_class...