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- How to convert clob to string in oracle
- In Oracle, you can use the "dbms_lob.substr()" method to convert clob data into a string. This method is used to convert the corresponding field into a string. The syntax is "select dbms_lob.substr(clob) from table;"; however When the length of the specified field in this method exceeds a certain value, an error will be reported.
- Oracle 22741 2022-06-10 17:39:47
- How to delete directory in oracle
- In Oracle, you can use the "drop directory" statement to delete the directory. This statement is used to delete the specified directory alias. The syntax is "drop directory DIRENAME;"; the directory is used to import and export the database.
- Oracle 6297 2022-06-10 17:39:56
- How to solve the 12514 error in oracle
- Method: 1. Open the "listener.ora" file, add the "...ORACLE_HOME = D:oracleproduct10.1.0db_1..." code in "SID_LIST_LISTENER" and save it; 2. Restart the TNSListener service to solve the problem.
- Oracle 10366 2022-06-10 17:19:38
- What is Oracle's interval query statement?
- Oracle's interval query statement: 1. "select * from table name where rownum <= value" statement, which queries the first few data specified in the table; 2. "select * from table name where rownum <= end value minus select * "from table name where rownum < starting value" statement, this statement queries the data in the specified interval in the table.
- Oracle 3348 2022-06-10 17:09:18
- How to check stored procedure status in oracle
- In Oracle, you can use the "select owner,name from v$db_object_cache where type like '%PROCE%' and locks >0 and pins >0;" statement to view the status of the stored procedure. This statement is used to view the running storage in ORACLE. process.
- Oracle 10161 2022-06-10 16:46:33
- What are the oracle logs?
- Oracle log: 1. Warning log, also known as "alert log" file; 2. Trace log, used to store seesion tracking information; 3. Audit log, used to store audit information; 4. Redo log, used to store database Change information; 5. Archive log, used to store historical backup of redo logs.
- Oracle 6590 2022-06-10 16:38:48
- How to query how many columns in oracle
- In Oracle, you can use the select statement with "count(*)" to query how many columns there are in the table. The syntax is "select count(*) from user_tab_cols where table_name='table name'"; "user_tab_cols" can also be used to query hidden columns, and English letters in table names should be in uppercase letters.
- Oracle 5867 2022-06-10 16:32:49
- What to do if Oracle foreign key fails
- In Oracle, you can use the "alter table" statement together with "enable constraint" to solve the problem of foreign key failure. The syntax is "alter table tableName enable constraint foreign key name;". This statement can restore the failed foreign key.
- Oracle 1891 2022-06-10 16:26:42
- What to do if Oracle synonym creation permission is insufficient
- In Oracle, you can use the "grant create synonym to username" statement to solve the problem of insufficient synonym creation permissions; this statement can add the permission to create synonyms to the specified user. If you want to create a private synonym in the architecture, you need to have "CREATE SYNONYM" system Authority.
- Oracle 4841 2022-06-10 16:04:14
- What is the command to delete data in oracle
- Oracle commands to delete data: 1. delete command, which is used to delete data in the table. The syntax is "delete from table name where condition"; 2. truncate command, which can also be used to delete data and can directly delete data from the table. The data is deleted at one time, and the syntax is "truncate table table name".
- Oracle 12748 2022-06-10 15:55:51
- What are the loop statements in Oracle stored procedures?
- Loop statements in Oracle stored procedures: 1. LOOP loop, the syntax is "loop loop body; EXIT WHEN end loop conditional expression; END LOOP;"; 2. WHILE loop, the syntax is "while conditional expression loop loop statement; end loop;"; 3. For loop, the syntax is "for variable IN (reverse) counter lower limit value... counter upper limit value LOOP loop body; END LOOP;".
- Oracle 13336 2022-06-10 15:49:28
- How to reverse oracle string
- In Oracle, you can use the reverse function to reverse a string. The function of this function is to reversely convert an object. The syntax is "select reverse('String to be reversed') from dual;"; this function It is to reverse the object encoding stored inside the database. What is stored is not the result of direct encoding, but after some kind of internal conversion.
- Oracle 2574 2022-06-10 15:40:57
- Are there dynamic statements in oracle?
- There are dynamic statements in Oracle; dynamic statements refer to SQL statements that are uncertain during compilation. The compiler does not process the dynamic statement part, but only creates the statement dynamically when the program is running, performs syntax analysis on the statement and executes the statement. The syntax is "EXECUTE IMMEDIATE dynamic SQL statement string INTO clause USING clause".
- Oracle 1637 2022-06-10 11:28:19
- Can one Oracle user have multiple table spaces?
- A user in Oracle can have multiple table spaces, but there is only one default table space. When creating tables, views, indexes, etc. without specifying a table space, they will be stored in the default table space; a user can use one or more tables. Space, a table space can also be used by multiple users.
- Oracle 5370 2022-06-10 11:18:37
- How to set the query date format in oracle
- In Oracle, you can use the "to_char()" function in conjunction with the select statement to set the date format of the query. The select statement is used to query data, and the "to_char()" function is used to set the date format. The syntax is "select to_char(date data column,'date format') from ...".
- Oracle 5552 2022-06-10 11:07:22
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