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This feature ensures you won t see errors caused by blank heading cells if you try to create or update a pivot table based on the Excel Table You can change the default column headings to something more descriptive, if you prefer Another advantage of using a formatted Excel Table is this: the column headings remain visible when you scroll down the worksheet This makes identifying the columns easier as you work in a large Excel Table When the heading row is no longer visible on the worksheet, the column headings are displayed in the column buttons at the top of the worksheet An Excel Table s heading cells contain drop-down lists that let you quickly and easily sort and filter the data in the table This feature can help you review the data before creating a pivot table or when troubleshooting a pivot table.

ops$tkyte@ORA11UTF> insert into t (a) values (unistr('\00d6')); insert into t (a) values (unistr('\00d6')) * ERROR at line 1: ORA-12899: value too large for column "OPS$TKYTE"."T"."A" (actual: 2, maximum: 1) This example demonstrates two things: VARCHAR2(1) is in bytes, not characters. We have a single Unicode character, but it won t fit into a single byte. As you migrate an application from a single-byte fixed-width character set to a multibyte character set, you might find that the text that once fit into your fields no longer does.

This program produces the following output: Hello Hello Hello Hello Jerry Elaine Elaine, Jerry Elaine, Jerry, George

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The reason for the second point is that a 20-character string in a single-byte character set is 20 bytes long and will absolutely fit into a VARCHAR2(20) However a 20-character field could be as long as 80 bytes in a multibyte character set, and 20 Unicode characters may well not fit in 20 bytes You might consider modifying your DDL to be VARCHAR2(20 CHAR) or using the NLS_LENGTH_SEMANTICS session parameter mentioned previously when running your DDL to create your tables If we insert that single character into a field set up to hold a single character, we will observe the following: ops$tkyte@ORA11UTF> insert into t (b) values (unistr('\00d6')); 1 row created.

ops$tkyte@ORA11UTF> select length(b), lengthb(b), dump(b) dump from t; LENGTH(B) LENGTHB(B) DUMP ---------- ---------- -------------------1 2 Typ=1 Len=2: 195,150 That INSERT succeeded, and we can see that the LENGTH of the inserted data is one character all of the character string functions work character-wise So the length of the field is one character, but the LENGTHB (length in bytes) function shows it takes 2 bytes of storage, and the DUMP function shows us exactly what those bytes are So, that example demonstrates one very common issue people encounter when using multibyte character sets, namely that a VARCHAR2(N) doesn t necessarily hold N characters, but rather N bytes.

The next issue people confront frequently is that the maximum length in bytes of a VARCHAR2 is 4,000 and in a CHAR is 2,000: ops$tkyte@ORA11UTF> declare 2 l_data varchar2(4000 char); 3 l_ch varchar2(1 char) := unistr( '\00d6' ); 4 begin 5 l_data := rpad( l_ch, 4000, l_ch ); 6 insert into t ( c ) values ( l_data ); 7 end; 8 / declare * ERROR at line 1: ORA-01461: can bind a LONG value only for insert into a LONG column ORA-06512: at line 6.

Let s start our custom function development with a trivial example, one that is very easy to follow. Let s implement hello_newman(), but with a slight twist. We want to include using function arguments in the example, so hello_newman() will take one argument: the name of the person addressing him. It will work as follows: sqlite > select hello_newman('Jerry') as reply; reply -----------------Hello Jerry sqlite > select hello_newman('Kramer') as reply; reply -----------------Hello Kramer sqlite > select hello_newman('George') as reply; reply -----------------Hello George Listing 7-1 shows the basic program (taken from hello_newman.c). Some of the error-checking code has been removed for clarity. Listing 7-1. The hello_newman() Test Program int main(int argc, char **argv) { int rc; sqlite3 *db; sqlite3_open_v2("test.db", &db); sqlite3_create_function( db, "hello_newman", 1, SQLITE_UTF8, NULL, hello_newman, NULL, NULL); /* Log SQL as it is executed. */ log_sql(db,1); /* Call function with one text argument. */ fprintf(stdout, "Calling with one argument.\n"); print_sql_result(db, "select hello_newman('Jerry')"); /* Call function with two arguments. ** It will fail as we registered the function as taking only one argument.*/ fprintf(stdout, "\nCalling with two arguments.\n"); print_sql_result(db, "select hello_newman ('Jerry', 'Elaine')");

For example, you can sort the values, to quickly spot the highest and lowest amounts in the table, or you can filter the data to view one region s sales records..

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