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SELECT * FROM `help_topic` ORDER BY `name` ASC
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完整内容 help_topic_id name 递增 递减 1 help_category_id description example url
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 312
 		312 ! 15 Syntax:
NOT, !

Logical NOT. Evaluates to 1 if the...		 
MariaDB> SELECT NOT 10;
        -> 0
MariaDB> SELE...
https://mariadb.com/kb/en/not/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 495
 		495 != 18 Syntax:
<>, !=

Not equal:

URL: https://mariadb.c...		 
MariaDB> SELECT '.01' <> '0.01';
        -> 1
Mari...
https://mariadb.com/kb/en/not-equal/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 174
 		174 % 4 Syntax:
N % M, N MOD M

Modulo operation. Returns ...		 https://mariadb.com/kb/en/modulo-operator/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 227
 		227 & 19 Syntax:
&

Bitwise AND:

URL: https://mariadb.com/...		 
MariaDB> SELECT 29 & 15;
        -> 13
https://mariadb.com/kb/en/bitwise_and/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 316
 		316 && 15 Syntax:
AND, &&

Logical AND. Evaluates to 1 if al...		 
MariaDB> SELECT 1 && 1;
        -> 1
MariaDB> SELE...
https://mariadb.com/kb/en/and/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 98
 		98 * 4 Syntax:
*

Multiplication:

URL: https://mariadb.c...		 
MariaDB> SELECT 3*5;
        -> 15
MariaDB> SELECT...
https://mariadb.com/kb/en/multiplication-operator/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 444
 		444 + 4 Syntax:
+

Addition:

URL: https://mariadb.com/kb/...		 
MariaDB> SELECT 3+5;
        -> 8
https://mariadb.com/kb/en/addition-operator/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 245
 		245 - BINARY 4 Syntax:
-

Subtraction:

URL: https://mariadb.com/...		 
MariaDB> SELECT 3-5;
        -> -2
https://mariadb.com/kb/en/subtraction-operator-/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 259
 		259 - UNARY 4 Syntax:
-

Unary minus. This operator changes the ...		 
MariaDB> SELECT - 2;
        -> -2
https://mariadb.com/kb/en/subtraction-operator-/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 268
 		268 / 4 Syntax:
/

Division:

URL: https://mariadb.com/kb/...		 
MariaDB> SELECT 3/5;
        -> 0.60
https://mariadb.com/kb/en/division-operator/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 217
 		217 < 18 Syntax:
<

Less than:

URL: https://mariadb.com/kb...		 
MariaDB> SELECT 2 < 2;
        -> 0
https://mariadb.com/kb/en/less-than/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 214
 		214 << 19 Syntax:
<<

Shifts a longlong (BIGINT) number to t...		 
MariaDB> SELECT 1 << 2;
        -> 4
https://mariadb.com/kb/en/shift-left/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 81
 		81 <= 18 Syntax:
<=

Less than or equal:

URL: https://mari...		 
MariaDB> SELECT 0.1 <= 2;
        -> 1
https://mariadb.com/kb/en/less-than-or-equal/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 117
 		117 <=> 18 Syntax:
<=>

NULL-safe equal. This operator perfor...		 
MariaDB> SELECT 1 <=> 1, NULL <=> NULL, 1 <=> NULL...
https://mariadb.com/kb/en/null-safe-equal/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 71
 		71 = 18 =

Equal:

URL: https://mariadb.com/kb/en/equal/

 
MariaDB> SELECT 1 = 0;
        -> 0
MariaDB> SELEC...
https://mariadb.com/kb/en/equal/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 469
 		469 > 18 Syntax:
>

Greater than:

URL: https://mariadb.com...		 
MariaDB> SELECT 2 > 2;
        -> 0
https://mariadb.com/kb/en/greater-than/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 283
 		283 >= 18 Syntax:
>=

Greater than or equal:

URL: https://m...		 
MariaDB> SELECT 2 >= 2;
        -> 1
https://mariadb.com/kb/en/greater-than-or-equal/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 382
 		382 >> 19 Syntax:
>>

Shifts a longlong (BIGINT) number to t...		 
MariaDB> SELECT 4 >> 2;
        -> 1
https://mariadb.com/kb/en/shift-right/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 90
 		90 ABS 4 Syntax:
ABS(X)

Returns the absolute value of X.

...		 
MariaDB> SELECT ABS(2);
        -> 2
MariaDB> SELE...
https://mariadb.com/kb/en/abs/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 446
 		446 ACOS 4 Syntax:
ACOS(X)

Returns the arc cosine of X, that...		 
MariaDB> SELECT ACOS(1);
        -> 0
MariaDB> SEL...
https://mariadb.com/kb/en/acos/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 231
 		231 ADDDATE 31 Syntax:
ADDDATE(date,INTERVAL expr unit), ADDDATE(...		 
MariaDB> SELECT ADDDATE('2008-01-02', 31);
       ...
https://mariadb.com/kb/en/adddate/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 59
 		59 ADDTIME 31 Syntax:
ADDTIME(expr1,expr2)

ADDTIME() adds expr2...		 
MariaDB> SELECT ADDTIME('2007-12-31 23:59:59.99999...
https://mariadb.com/kb/en/addtime/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 497
 		497 AES_DECRYPT 12 Syntax:
AES_DECRYPT(crypt_str,key_str)

This funct...		 https://mariadb.com/kb/en/aes_decrypt/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 443
 		443 AES_ENCRYPT 12 Syntax:
AES_ENCRYPT(str,key_str)

AES_ENCRYPT() an...		 
INSERT INTO t VALUES (1,AES_ENCRYPT('text','passwo...
https://mariadb.com/kb/en/aes_encrypt/
编辑 编辑 复制 复制 删除 删除
DELETE FROM `help_topic` WHERE `help_topic`.`help_topic_id` = 212
 		212 ALTER DATABASE 39 Syntax:
ALTER {DATABASE | SCHEMA} [db_name]
   al...		 https://mariadb.com/kb/en/alter-database/
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